On Sat, 26 Jul 2025, Zakaria wrote:
Under what circumstances does this happen? I tried to provoke a mailout
by sending messages to recipients with full quotas and permission locked
mailbox files, but could not generate any mail back.
You might be able to generate mail back via rejecting email e.g. any email
coming with specific address at MTA level such as Postfix/EXIM. Afaik,
dovecot doesn't generate mail back when mail box having already exceeded
quota limit but just reject the email while MTA can deny the email at SMTP
level when it arrives and before getting delivered via LMTP/LDA and generates
automatic response with message like 541/550 error to the sender.
Thanks.
Rejecting at the SMTP level makes the sending MTA responsible for the
bounce message to sender: dovecot is never involved. I need to test
dovecot ability to hand off messages to the sendmail_path executable to
test whether the bounce message it produces gets DKIM signed.
I was eventually able to get dovecot-lda to invoke the sendmail_path
executable by constraining the size of a recipient's INBOX (via quota),
then sending a message to that recipient. This produced a full-mailbox
error message back to the sender.
Part of the complication is whether the LDA error produces an
immediate permanent error or TEMPFAIL condition, which could delay
the bounce message being issued. In this case, I needed to set
quota_full_tempfail=no to get an immediate bounce message.
All good now.
Joseph Tam <[email protected]>
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