[Bug]: config parm 'mail_domain' is ignored when entering SMTP init phase

⚠️ This issue respects the following points: ⚠️ • This is a bug, not a question or a configuration/webserver/proxy issue. • This issue is not already reported on [Github]( OR [Nextcloud Community Forum]( _(I've searched it)_. • Nextcloud Server is up to date. See [Maintenance and Release Schedule]( for supported versions. • I agree to follow Nextcloud's [Code of Conduct]( Bug description When configuring an SMTP host, one would expect the content of the config parameter mail_domain to be used as the FQDN for the SMTP handshake when issuing an EHLO response (per documentation in ). Regardless of configuration, the content of this variable doesn't find it into the Symfony Mail SMTP transport component configuration dictionary entry local_domain as one would expect. Steps to reproduce 1. Configure SMTP host per documentation 2. Send test mail per Settings->Basic settings->Email server UI 3. Watch logs on the SMTP server side when …