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.

[imagem] 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.

Erro de muitos destinatários para e-mails para destinatários externos

Suporte ao Produto

chapoi Junho 11, 2026, 12:17pm 2

Acho que isso disparou o erro; é uma proteção contra spam e abuso.

Quantos membros há nesse grupo?

Tópico		Respostas	Visualizações
Email-in to multiple groups Product Support	4	708	2 de Dezembro de 2020
Mail-Receiver - public email address, do I need to worry about Spam? Product Support mail-receiver	5	311	16 de Outubro de 2026
Incoming Email - Only first recipient is handled Bug	0	481	11 de Setembro de 2021
One of my users just group messaged 100 other user with a spam offer Product Support	9	2412	6 de Julho de 2017
Reply by email - additional addresses Product Support	28	3327	19 de Agosto de 2019

Erro de muitos destinatários para e-mails para destinatários externos

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