create a custom file such as main.cf.custom and then add a command to plesk's scheduler for after update completed: cp custom.file /etc/postfix/main.cf

The possibility to override settings for postfix (as it is possible with dovecot/apache) is sorely needed.

I modified my main.cf to include blacklisted recipients, which also gets overwritten from time to time:

smtpd_recipient_restrictions = … , hash:/etc/postfix/rejected_recipients

required for activate journaling to an archive

required is plesk to support mail relay settings as alternative such a SendGrid when plesk is hosted on an hyperscaler blocking port 25, e.g.: GCP

I want to be able to customize master.cf. But, currently, any customizations to master.cf get overwritten.

I would love to see a main.cf editor like it’s present for panel.ini for example. We need to adjust a few things too and never know when they gets overwritten.

Plus addressing/sub addressing are now standard and required if we are migrating customers into Plesk or Plesk Premium Email. This needs to be addressed in about 30 minutes..

My modifications for virtual_mailbox_domains in main.cf get reverted every weekend and I've to modify once a week and repeat forever. That would be nice feature to prevent any modifications in main.cf file.

We need this asap. Thinkin on moving away from plesk.

We really need to customize several settings in Postfix for some of our customers, this feature would be a lifesaver.

We would like to customize /etc/postfix/main.cf, please.

would be a nice feature, also customization of /etc/postfix/master.cf

We need this feature too.

This is really needed for proper mailserver configuration. E.g. preventing the server from sending backscatter...

Please make at least smtp_recipient_restrictions configurable and do not just overwrite it with next to nothing + blacklists. This option is essential for correct mailserver configuration.

Would already help to have something similar to how Apache additional settings are handled - just a text box that holds the settings that will be re-applied/appended at the very moment the config is changed/overwritten.
Only administrators that know what they are doing will use this ... (I guess ... LOL).

Including the necessary SPF records, if possible.

Of course you can edit the e-mail relay (i.e. for homeservers) via /etc/postfix/main.cf, but it would be better and nicer if you could manage this directly in Plesk Settings.

Can you clarify on what distribution you have the issue that your changes are overrwitten? We use Plesk on Debian, and we have set the reicpient_delimiter manually (as well as some other settings) and we do not see them get overwritten.