I need to use plain text authentication. I have to migrate an old postfix server that uses this authentication mode. I have a lot of devices configured in this way. I have to plan the migration to TLS, while I want to use OpenSMTPD with plain text authentication. It's possible?

It's not possible to use plain text authentication with OpenSMTPD.

I guess your migration plan has to give OpenSMTPD a different hostname or port and let postfix run till ever device is moved to a TLS config.

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