Set up mail-receiver, but now site won't send any emails?

[ToddZ]

@Simon_Manning @pfaffman –

EDIT: see end of message

Thanks for the responses! I’ve had to be away for a bit, but am digging back into this…

@Simon_Manning

Just to confirm, it sounds like you have these (among the rest) in app.yml:

DISCOURSE_SMTP_USER_NAME: admin@tasat.org
DISCOURSE_NOTIFICATION_EMAIL: admin@tasat.org

And this in reply by email address:

replies+%{reply_key}@forum.tasat.org

Is that right?

Yes, that’s what I have at the moment.

@Simon_Manning

If so, do email notifications that don’t accept replies still work? I believe the email verification is an example of that, so you could try creating an account and see if that email is sent successfully.

When I try creating an account now, the submit button doesn’t do anything. As if it knows it won’t work. (And nothing shows up in Skipped or elsewhere.)

@Simon_Manning

Typically Reply-To is not treated as part of the sender information, it just provides a default To address to use when people reply, but perhaps Hostinger do treat it as such. You might be able to add a sending alias for replies@forum.tasat.org.

Edit: I have set “replies@tasat.org” as a sending alias for admin@tasat.org, and confirmed that it works for sending and receiving. I’ve also confirmed delivery of an email sent from an external client addressed to replies+verp-174bc7d8411bc4ec2cfa84c55bd31425@forum.tasat.org

In the interest of trying something, I changed reply by email address:
from replies+%{reply_key}@forum.tasat.org
to replies+%{reply_key}@tasat.org

But it doesn’t change the results.

What happens if you try sending a test email to an address you get from https://www.mail-tester.com/?

It doesn’t arrive at mail-tester. All outgoing attempts end up under “skipped” with a variety of this message:

553 5.7.1 <replies+verp-8c79cd4e83023bda6df0624c2cacd36e@tasat.org>: 
Sender address rejected: not owned by user admin@tasat.org 

Maybe this is interesting..? When I run discourse-doctor, outbound email fails as follows:

==================== MAIL TEST ====================
For a robust test, get an address from http://www.mail-tester.com/
Sending mail to REDACTED  . . 
Testing sending to admin@tasat.org using smtp.titan.email:587, 
username:admin@tasat.org with plain auth.
SMTP server connection successful.
Sending to admin@tasat.org. . . 
Mail was not sent.

Reason: 553 5.7.1 <replies+verp-3cc19f7b135e6f56219e030999db9e29@tasat.org>: 
Sender address rejected: not owned by user admin@tasat.org

Sending directly to the replies+ address (or a forum.tasat.org address) from an email client works – it follows the “replies” alias and ends up in the admin inbox. Where is the rejection coming from?

I had a look at the article section “Prevent outgoing host email from interfering.” I have no path /etc/postfix – but here’s my netstat output:

root@forum:/var/discourse# netstat -tulpn | grep :25
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      1487576/docker-prox
tcp6       0      0 :::25                   :::*                    LISTEN      1487581/docker-prox

MAJOR EDIT – I heard back from Titan support tonight: “The reply-to address and from address should be the same or else the email won’t go through.” So I guess all the troubleshooting is out the window and I have to look for a new email host that doesn’t impose that requirement.