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> When using dovecot container with sieve plugin there is no sendmail to use for sending email for sieve redirect action for example. We can use submission_host instead https://doc.dovecot.org/settings/core/#core_setting-submission_host but there is no way to specify credentials for auth in remote MTA. Submission_relay_* settings e.g. submission_relay_master_user relate to dovecot submission

...tell the MTA to use it. For example, if you use postfix this explains how: https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/ -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://dovecot.org/pipermail/dovecot/attachments/20230117/69d09445/attachment.htm>