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director_mail_servers setting uses IP Adresses as values https://doc.dovecot.org/settings/core/#core_setting-director_mail_servers As described in the documentation, hostnames are converted to addresses when the configuration is read https://doc.dovecot.org/settings/types/#ip-addresses This is acceptable in host or virtual machine environment, but becomes a problem in a containerized environment.

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

Thanks for the reply, postfix + dovecot sasl configured and working properly. My question is about "adding dovecot authentication when sending emails via submission_host". Let's say we have dovecot + sieve plugin container. Dovecot configured to use remote SMTP submission host to send messages: submission_host = postfix.example.com:587 User foo at example.com has the following