An email was sent from a user (with the email address linked to her Discourse account) to several recipients, including a Discourse group alias. The email was rejected with the Email::Receiver::TooManyRecipientsError error. Why would Discourse care of the number of recipients if these recipients are external addresses? Is it normal that the email be rejected?

Hm, 17 isn’t that much, but it’s more than the default allowed. What is this setting set to on your forum? [CleanShot 2026-06-11 at 15.44.45] Does changing that to >17 changes anything? Or, if you were to try it without that discourse group alias, does it work then? If so for either, that would confirm my suspicion it’s this an anti-spam measure throwing the error.

[图片] pHneutre: a Discourse group alias I think this will have triggered the error; this is an anti-spam and anti-abuse guard. How many members are in that group?

I don’t understand what you say is triggering the error.

I haven’t tested but yes, this parameter is 10, and it says so in the rejection email. If I try without the group alias, Discourse is not involved anymore in any way so I expect no reaction. But if that means that writing to a bunch of people including a discourse group is enough to be rejected, I will most definitely change that parameter value. Thanks for the insight.

发送给外部收件人的邮件出现收件人过多错误

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chapoi 2026 年6 月 11 日 12:17 2

我认为这会触发错误；这是一个反垃圾和反滥用保护机制。

该群组有多少成员？

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