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Discord's URIs trigger Rspamd's URIBL_SBL flag and emails get rejected

l4p1n

When requesting a password or confirming an email, I have noticed that the URIBL_SBL flag is applied and the email in question receives 32.5 points. Plus another handful of flags get applied too but have an negligible to no impact as they cancel each other out. Even with those flags, Discord's emails land in the inbox.

All the applied flags, included URIBL_SBL, give a grand total of 35.81 points of 15. In other words, the email gets rejected by the mail server and the aforementioned flag is practically a guaranteed reject.

Upon further analysis, it seems like the domain "discordapp.com" trips Rspamd's URIBL_SBL flag. This theory seems to be confirmed as I was setting some configuration to disable the use of SpamHaus SBL URIBL and trying to forward the email to my other email addresses to test the new configuration with some variations of the URL.

Of course, this does not exclude a misconfiguration in my antispam but that is unlikely.

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