I have tried many different configuration options but using either Outlook or Thunderbird on macOS I cannot send through a server migrated to a new machine. I have done the Dovecot troubleshooting from: https://wiki2.dovecot.org/TestInstallation and it passed.
IRRC, when sending from a client one is actually talking to Sendmail not Dovecot, is that right? BTW, receiving works fine, just cannot send.
Using Auth with pam. Procmail with Spamassassin is there and working.
Is sasl needed?
I would appreciate any help, I have configured this several times previously over some years and always managed to make it work.