Thunderbird 生成的回复中的 URL 被删除

[BradCray (Brad Chamberlain)]

One of our team members who uses Thunderbird as their email client is finding that URLs they send to a Discourse topic in a reply mail results in the URLs being stripped from the message (i.e., the message is added to the topic, but any URLs in the message body have been removed when viewed on the Discourse site or in email notifications generated about the new message).

[edit: whitespace, like newlines, is being stripped as well, which I didn’t fully realize when making this original post or capturing the resulting output, which is updated below]

Some key lines from the Thunderbird-generated mail header are as follows (please let me know if there are others I should share):

User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.12.0
Content-Type: text/plain; charset=utf-8; format=flowed

An example of such a message is:

https://github.com/chapel-lang/chapel/pull/16369 will make it only run under valgrind or with the address sanitizer.

Thanks,

Lydia

which shows up on Discourse as:

will make it only run under valgrind or with the address sanitizer. Thanks, Lydia

where the URL has disappeared, as have the newlines.

This behavior seems to be consistent whether the URL is the first non-whitespace content in the message body, or somewhere in the middle of the message.

Sending the identical message in other ways, particularly other plaintext ways, causes the URLs to be preserved:

• from alpine (Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII)
• from gmail using “plain text” mode (Content-Type: text/plain; charset="UTF-8")
• from OWA (Content-Type: text/html; charset="iso-8859-1")

Things we’ve tried to do to debug:

• paste the Thunderbird-generated message with full header into the admin/email/advanced test tool, which seems to correctly identify the body of the message and preserve the URL
• increasing the user’s trust level
• have the user send the same message from the same Thunderbird session to other external mail recipients to make sure the URL was preserved

We’re looking for help determining what’s going wrong or what more we could do to debug the issue on our side. For example, is there any way for us (or for you) to view the raw received mail and/or to debug how it was processed beyond the “advanced test” tool?

Thanks very much for any help with this,
-Brad

[Justin_Vega]

I happen to have Mozilla Thunderbird and I use it very frequently, so let me try reproducing the problem.

Actually, have you told your team member to update to the latest version of Mozilla Thunderbird? The latest stable (ESR) version is 78. That could possibly help.

What’s New in Thunderbird 78

[BradCray (Brad Chamberlain)]

Thanks, Justin. I’ll see whether they’re able to update, though we’d definitely also be curious whether you can reproduce (with whatever version of Thunderbird) as well since that should hopefully be simple. I see the URL in the post you made here, but it looks like you made it via the web interface rather than via reply-by-mail?

Also, we’ve gathered more data since my original post:

• When posting a new topic to a category’s email alias, the user’s URL’s are preserved
• When surfing to the sent-mail folder and replying to one of their previous replies to a topic, the URL’s are preserved
• When replying to a Discourse-generated email notification of a post to the topic, the URLs are stripped (also, the whitespace is stripped, which I hadn’t realized or captured correctly in my OP; I’ll edit it to clarify that).

So many cases work, but replies to notifications don’t seem to.

I’d be happy to point Discourse developers to the messages in question if that would help debug this.

[riking (Kane York)]

Can you post the relevant sections of the raw email that Discourse received? Click on the icon as an admin to pull that up.

Make sure to include both the HTML and plain parts.

[BradCray (Brad Chamberlain)]

Thanks @riking, I hadn’t yet found that the envelope icon was a way to see the raw mail—great feature! (and I’m embarrassed not to have noticed it before)

Now that you’ve pointed that out to me, I’m finding that if I post the raw text into the “Advanced Test” tool, I see the result get similarly stripped, which is encouraging. It also looks like I was incorrect in thinking that the Thunderbird mail was raw text only (I came to that conclusion by having her send me the same mails directly and examining them, but must’ve drawn the wrong conclusions from that process?).

Now that I know about the envelope icon, I’ll try to compare the posts and replies that preserved URLs vs. those that didn’t to see if I can discern what the difference is between the cases.

Meanwhile, here’s the raw email in case you’re able to figure out what’s going wrong faster (let me know if this is not what you meant by “HTML and plain parts”):

Received: from mx0a-002e3701.pphosted.com (mx0a-002e3701.pphosted.com [148.163.147.86])
	by mail-receiver-stardestroyer02.localdomain (Postfix) with ESMTPS id 327765A0034
	for <[redacted]@discoursemail.com>; Thu, 10 Sep 2020 21:45:28 +0000 (UTC)
Received: from pps.filterd (m0150242.ppops.net [127.0.0.1])
	by mx0a-002e3701.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 08ALh9Yf003180
	for <[redacted]@discoursemail.com>; Thu, 10 Sep 2020 21:45:27 GMT
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=hpe.com; h=subject : to :
 references : from : message-id : date : in-reply-to : content-type :
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https://github.com/chapel-lang/chapel/pull/16369 will make it only run 
under valgrind or with the address sanitizer.

Thanks,
Lydia

On 9/10/20 10:28 AM, Michael Ferguson via Chapel Programming Language wrote:
> [mppf] 	mppf 
> <https://chapel.discourse.group/u/mppf> 
>
> September 10
>
> Hi Lydia-
>
> On my system, this test core dumps both before and after that PR.
> I think that this was a sporadic pass and that
> this test needs to run under valgrind in order to avoid that.
>
> -michael
>
> Hi Michael,
>
> |Would it make sense for your change to inout to have fixed this 
> future? I'm not sure there's a better candidate PR Thanks, Lydia|
> ------------------------------------------------------------------------
>
> Visit Topic 
> <https://chapel.discourse.group/t/cron-fast/485/3> 
> or reply to this email to respond.
>
> ------------------------------------------------------------------------
>
>
>         In Reply To
>
> [chapelu] 	chapelu 
> <https://chapel.discourse.group/u/chapelu> 
>
> September 10
>
> === Summary =================================================== 
> Hostname: chapvm12 Revision: 
> https://github.com/chapel-lang/chapel/commit/a07bdf4084 Logfile: 
> /data/sea/chapel/Nightly/day3-Wed-fast.log Started: Wed Sep 9 02:00:21 
> 2020 Ended: Wed Sep 9 23:52:03 2020 Tests run: View this …
> ------------------------------------------------------------------------
>
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    <a class="moz-txt-link-freetext" href="https://github.com/chapel-lang/chapel/pull/16369">https://github.com/chapel-lang/chapel/pull/16369</a> will make it only
    run under valgrind or with the address sanitizer.<br>
    <br>
    Thanks,<br>
    Lydia<br>
    <br>
    <div class="moz-cite-prefix">On 9/10/20 10:28 AM, Michael Ferguson
      via Chapel Programming Language wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:[redacted]@hpe.com">
      
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                <td> <a href="https://chapel.discourse.group/u/mppf" target="_blank" style="color:#006699;;
                    font-size:13px;font-family:'lucida
grande',tahoma,verdana,arial,sans-serif;text-decoration:none;font-weight:bold;
                    text-decoration: none; font-weight: bold; color:
                    #006699;" moz-do-not-send="true">mppf</a> <br>
                  <span style="text-align:right;color:#999999;padding-right:5px;font-family:'lucida
grande',tahoma,verdana,arial,sans-serif;font-size:11px">September 10</span>
                </td>
              </tr>
            </tbody>
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          <div style="padding-top:5px;">
            <p style="margin-top:0; border: 0;">Hi Lydia-</p>
            <p style="margin-top:0; border: 0;">On my system, this test
              core dumps both before and after that PR.<br>
              I think that this was a sporadic pass and that<br>
              this test needs to run under valgrind in order to avoid
              that.</p>
            <p style="margin-top:0; border: 0;">-michael</p>
            <p style="margin-top:0; border: 0;">Hi Michael,</p>
            <pre style="word-wrap: break-word; max-width: 694px;"><code style="display: block; background-color: #f1f1ff; padding: 5px;; background-color: #f1f1ff; padding: 2px 5px;">Would it make sense for your change to inout to have fixed this future?  I'm not sure there's a better candidate PR

Thanks,
Lydia</code></pre>
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                  <span style="text-align:right;color:#999999;padding-right:5px;font-family:'lucida
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          </table>
          <div style="padding-top:5px;">=== Summary
            ===================================================
            Hostname: chapvm12 Revision: <a href="https://github.com/chapel-lang/chapel/commit/a07bdf4084" style="text-decoration: none; font-weight: bold; color:
              #006699;" moz-do-not-send="true">https://github.com/chapel-lang/chapel/commit/a07bdf4084</a>
            Logfile: /data/sea/chapel/Nightly/day3-Wed-fast.log Started:
            Wed Sep 9 02:00:21 2020 Ended: Wed Sep 9 23:52:03 2020 Tests
            run: View this …</div>
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[Falco]

The interesting part being:

    <a class="moz-txt-link-freetext" href="https://github.com/chapel-lang/chapel/pull/16369">https://github.com/chapel-lang/chapel/pull/16369</a> will make it only
    run under valgrind or with the address sanitizer.<br>
    <br>
    Thanks,<br>
    Lydia<br>
    <br>

[BradCray (Brad Chamberlain)]

Right. And it definitely seems to be that HTML version that’s making it through to the post (rather than the text version of the message), as determined by editing each versoin of the message in the “Advanced Test” tool. So it seems that the tool strips all the HTML from this mail (which also explains the linefeeds going away), but doesn’t in the OWA version of the message, which is also multipart. I’m currently comparing the two messages to try and determine why that is.

Here’s an OWA version of the message that preserves the link and whitespace, for comparison:

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https://github.com/chapel-lang/chapel/pull/16369 will make it only run
under valgrind or with the address sanitizer.


Thanks,
Lydia

(Trying with outlook instead of Thunderbird in case that does anything)
________________________________
From: Michael via Chapel Programming Language <[redacted]@discoursemai=
l.com>
Sent: Thursday, September 10, 2020 10:28 AM
To: Lydia <[redacted]@hpe.com>
Subject: Re: Cron fast

[https://avatars.discourse-cdn.com/v4/letter/m/94ad74/45.png]   mppf<https:=
//chapel.discourse.group/u/mppf>
September 10

Hi Lydia-

On my system, this test core dumps both before and after that PR.
I think that this was a sporadic pass and that
this test needs to run under valgrind in order to avoid that.

-michael

Hi Michael,

Would it make sense for your change to inout to have fixed this future?  I'=
m not sure there's a better candidate PR

Thanks,
Lydia

________________________________

Visit Topic<https://chapel.discourse.group/t/cron-fast/485/3> or reply to t=
his email to respond.

________________________________
In Reply To
[https://sjc2.discourse-cdn.com/free1/user_avatar/chapel.discourse.group/ch=
apelu/45/23_2.png]   chapelu<https://chapel.discourse.group/u/chapelu>
September 10
=3D=3D=3D Summary =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D Hostname: chapvm12 Revision: https://github.com/chape=
l-lang/chapel/commit/a07bdf4084 Logfile: /data/sea/chapel/Nightly/day3-Wed-=
fast.log Started: Wed Sep 9 02:00:21 2020 Ended: Wed Sep 9 23:52:03 2020 Te=
sts run: View this =85
________________________________

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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<p style=3D"margin-top:0; border: 0"><a href=3D"https://github.com/chapel-l=
ang/chapel/pull/16369" style=3D"font-weight: bold; color: #006699">https://=
github.com/chapel-lang/chapel/pull/16369</a> will make it only run<br>
under valgrind or with the address sanitizer.</p>
<p style=3D"margin-top:0; border: 0"><br>
</p>
<p style=3D"margin-top:0; border: 0">Thanks,<br>
Lydia</p>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
(Trying with outlook instead of Thunderbird in case that does anything)<br>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Michael Ferguson via =
Chapel Programming Language &lt;[redacted]@discoursemail.com&gt;<br>
<b>Sent:</b> Thursday, September 10, 2020 10:28 AM<br>
<b>To:</b>Lydia &lt;[redacted]@hpe.com&gt;<br>
<b>Subject:</b> Re: Cron fast</font>
<div>&nbsp;</div>
</div>
<div dir=3D"ltr" style=3D"text-align:left">
<div>
<div></div>
<div style=3D"margin-bottom:25px">
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0">
<tbody>
<tr>
<td style=3D"vertical-align:top; width:55px"><img title=3D"mppf" width=3D"4=
5" height=3D"45" src=3D"https://avatars.discourse-cdn.com/v4/letter/m/94ad7=
4/45.png">
</td>
<td><a href=3D"https://chapel.discourse.group/u/mppf" target=3D"_blank" sty=
le=3D"color:#006699; font-size:13px; font-family:'lucida grande',tahoma,ver=
dana,arial,sans-serif; text-decoration:none; font-weight:bold; text-decorat=
ion:none; font-weight:bold; color:#006699">mppf</a>
<br>
<span style=3D"text-align:right; color:#999999; padding-right:5px; font-fam=
ily:'lucida grande',tahoma,verdana,arial,sans-serif; font-size:11px">Septem=
ber 10</span>
</td>
</tr>
</tbody>
</table>
<div style=3D"padding-top:5px">
<p style=3D"margin-top:0; border:0">Hi Lydia-</p>
<p style=3D"margin-top:0; border:0">On my system, this test core dumps both=
 before and after that PR.<br>
I think that this was a sporadic pass and that<br>
this test needs to run under valgrind in order to avoid that.</p>
<p style=3D"margin-top:0; border:0">-michael</p>
<p style=3D"margin-top:0; border:0">Hi Michael,</p>
<pre style=3D"word-wrap:break-word; max-width:694px"><code style=3D"display=
:block; background-color:#f1f1ff; padding:5px; background-color:#f1f1ff; pa=
dding:2px 5px">Would it make sense for your change to inout to have fixed t=
his future?  I'm not sure there's a better candidate PR

Thanks,
Lydia</code></pre>
</div>
</div>
<div style=3D"color:#666">
<hr style=3D"background-color:#ddd; height:1px; border:1px; background-colo=
r:#ddd; height:1px; border:1px">
<p><a href=3D"https://chapel.discourse.group/t/cron-fast/485/3" style=3D"te=
xt-decoration:none; font-weight:bold; color:#006699; color:#666">Visit
 Topic</a> or reply to this email to respond.</p>
</div>
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r:#ddd; height:1px; border:1px">
<h4 style=3D"font-size:17px; color:#444; margin-bottom:10px; color:#222">In=
 Reply To</h4>
<div style=3D"margin-bottom:25px">
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0">
<tbody>
<tr>
<td style=3D"vertical-align:top; width:55px"><img title=3D"chapelu" width=
=3D"45" height=3D"45" src=3D"https://sjc2.discourse-cdn.com/free1/user_avat=
ar/chapel.discourse.group/chapelu/45/23_2.png">
</td>
<td><a href=3D"https://chapel.discourse.group/u/chapelu" target=3D"_blank" =
style=3D"color:#006699; font-size:13px; font-family:'lucida grande',tahoma,=
verdana,arial,sans-serif; text-decoration:none; font-weight:bold; text-deco=
ration:none; font-weight:bold; color:#006699">chapelu</a>
<br>
<span style=3D"text-align:right; color:#999999; padding-right:5px; font-fam=
ily:'lucida grande',tahoma,verdana,arial,sans-serif; font-size:11px">Septem=
ber 10</span>
</td>
</tr>
</tbody>
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[BradCray (Brad Chamberlain)]

Oh, interesting. All it takes for me to change the broken version in this message to a working version in the “Advanced Test” tool is to remove class="moz-txt-link-freetext" from the <a href> link… Is that surprising?

[BradCray (Brad Chamberlain)]

To be make my previous question a bit more precise, is it a bug on Thunderbird’s part that it puts class="moz-txt-link-freetext into hyperlinks in emails that it sends? Is it a bug on Discourse’s part that the presence of such a tag causes the <a>...</a>-enclosed URL to be dropped from the body of the message and subsequent <br> tags to be ignored?

[BradCray (Brad Chamberlain)]

Hi @Falco and @riking — Sorry to bug you, but since you’d looked at this issue previously: do you have any thoughts on my questions in the previous post about whether this is buggy behavior on the part of Thunderbird and/or Discourse? Thanks.

[bsoares (Ben Soares)]

你好 @BradCray，

我在对 Mailman mbox 归档使用 import_mbox.sh 时也遇到了同样的问题。

我将问题定位到了 lib/email/receiver.rb 中的 extract_from_mozilla(doc) 方法，并做了一个简单的修复，已提交至 PR https://github.com/discourse/discourse/pull/13176。

extract_from_mozilla 方法会将所有 class 属性以 "moz-" 开头的标签设为隐藏。我的调整排除了 class 属性以 ^moz-txt-link\\b 开头的标签，我认为这涵盖了 Thunderbird 的链接（基于我处理的大型 mbox 文件）。

我还没来得及编写测试用例，因此该 PR 可能不会被接受，但欢迎随时使用（不过请注意，除非该 PR 被合并，否则任何升级都可能会覆盖此修改）。

我仅在导入的 mbox 上进行了测试，但认为它也应适用于新收到的邮件。
遗憾的是，我认为它在重新烘焙（rebake）时不会生效（对我而言确实如此），因此可能很难进行回溯应用。

[bsoares (Ben Soares)]

@BradCray，供你知悉，如果没有测试，PR 将不会被接受，而且我还需要一段时间才能有机会着手处理测试事宜。

[BradCray (Brad Chamberlain)]

感谢尝试修复此问题并更新，@bsoares！如果你暂时无法处理，也许你的 PR 能激励其他已经熟悉 Discourse 测试的人接手测试工作。我有点惊讶这个问题没有引起更多的关注或担忧，因为在我看来，Thunderbird 是一款相当流行的邮件客户端（尽管我本人并不使用它）。

再次感谢，
-Brad

[bsoares (Ben Soares)]

感谢评论 @BradCray。希望我能找到时间——工作方面表示我可以花些时间处理，但可能至少还要等几周。我也很惊讶对此提及不多，正如你所说，Thunderbird 是一款流行的邮件客户端。我们刚刚切换到 Discourse，我一直在尝试导入 Mailman 的 mbox 文件，我的同事几乎立刻就发现了这个问题！诊断花了一些时间，因为 Thunderbird 的邮件本身没有问题，问题出在 lib/email/receiver.rb 中一个过于激进的签名/回复隐藏逻辑上！

[bsoares (Ben Soares)]

@BradCray（以及任何正在寻找此问题修复方案的人），我近期没有时间为这个修复提交包含测试的正式 PR。因此，我为我们的 Discourse 部署准备了一个补丁，只要相关方法不被更改，该补丁应该能持续生效（如果方法被更改，希望届时能得到正式修复）。

请将附件 lib_email_receiver_rb-thunderbird_links.patch 放入，例如 /var/discourse/shared/standalone/patches.txt：
lib_email_receiver_rb-thunderbird_links.patch.txt (819 Bytes)
（你可能需要先执行以下命令创建目录）：

mkdir -p  /var/discourse/shared/standalone/patches

然后在 containers/app.yml 的 hooks: after_code 部分（如果有插件，请放在插件之后）添加以下内容：

hooks:
  after_code:
    # 在此处放置插件的 "-exec" 命令
    - exec:
        cd: $home
        cmd:
          - git apply /shared/patches/lib_email_receiver_rb-thunderbird_links.patch.txt

这假设你在 volumes: 部分已将 /var/discourse/shared/standalone 映射到 /shared，请根据你的环境进行调整。

你需要使用 ./launcher rebuild app 重新构建容器，但在重新构建时修复应该会被保留。不过，我不确定通过 Web 管理员触发的更新是否会应用此修复。

（附件扩展名为 .txt 以便能附加到此评论中，你可能希望从文件名和配置中移除它。）

[jzedlitz (Jesper Zedlitz)]

我也遇到了同样的问题。因此，我想尝试使用补丁文件提供的解决方案/变通方法。不幸的是，附件 lib_email_receiver_rb-thunderbird_links.patch 未正确上传。您能重新发送一下吗？也许可以直接作为代码块发送？

[bsoares (Ben Soares)]

您好，我已再次附上该文件（因上传原因添加了 ‘.txt’ 后缀），内容如下：

diff --git a/lib/email/receiver.rb b/lib/email/receiver.rb
index a6da67cbaa..38c8439f38 100644
--- a/lib/email/receiver.rb
+++ b/lib/email/receiver.rb
@@ -480,8 +480,12 @@ module Email
 
     def extract_from_mozilla(doc)
       # Mozilla (Thunderbird ?) 能正确识别签名和转发邮件
-      # 移除它们及其之后的所有内容
-      elided = doc.css("*[class^='moz-'], *[class^='moz-'] ~ *").remove
+      # 移除它们及其之后的所有内容。保留 moz-txt-link- 类，因为它们是链接。
+      elided = doc.css("*[@class]:mozfilter", Class.new {
+        def mozfilter node_set
+          node_set.find_all { |node| node["class"] =~ /^moz-/ and node["class"] !~ /^moz-txt-link\b/ }
+        end
+      }.new).remove
       to_markdown(doc.to_html, elided.to_html)
     end

lib_email_receiver_rb-thunderbird_links.patch.txt (819 字节)

为修复我在前一条帖子中刚发现的拼写错误，请使用此补丁。将该补丁文件保存为 ~/lib_email_receiver_rb-thunderbird_links.patch.txt，然后执行：

mkdir -p /var/discourse/shared/standalone/patches
cp ~/lib_email_receiver_rb-thunderbird_links.patch.txt /var/discourse/shared/standalone/patches/

之后，按上述说明编辑 containers/app.yml。

[Flominator]

谢谢，效果非常好，除了带别名的链接（例如 这个链接）会被分开……

[bsoares (Ben Soares)]

@Flominator 很高兴它至少部分能工作了！我很想调整 mozfilter 部分，使其不丢弃带有别名的链接。我之前没见过这种情况，也未能找到关于 Thunderbird 链接类的文档。不过它的功能并不复杂，所以可能无法处理！您能否发布或私信我创建该帖子的邮件中的 HTML 源代码，以便我查看？谢谢！

[Flominator]

大致如下：

    <p>一些文本，<a moz-do-not-send="true"
        href="https://ro.wikipedia.org/wiki/Crai_Nou,_Timi%C8%99">带别名的链接</a>更多文本</p>