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Code Issues Releases Activity

Add FAQ about clients on port 25 generating non-helpful errors

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Dario Ernst 2019-02-09 12:33:33 +01:00
parent 4d58b322bc
commit 328db51032
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docs/faq.rst
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@ -421,3 +421,7 @@ We **strongly** advice against downgrading the TLS version and ciphers!
.. _`681`: https://github.com/Mailu/Mailu/pull/681
.. _`698`: https://github.com/Mailu/Mailu/issues/698
.. _`unbound`: https://nlnetlabs.nl/projects/unbound/about/
A user gets ``Sender address rejected: Access denied. Please check the message recipient […] and try again`` even though the sender is legitimate?
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First, check if you are really sure the user is a legitimate sender, i.e. the registered user is authenticated successfully and own either the account or alias he/she is trying to send from. If you are really sure this is correct, then the user might try to errornously send via port 25 insteadof the designated SMTP client-ports. Port 25 is meant for server-to-server delivery, while users should use port 587 or 465.