Marc ARC wrote on 18/08/2021 20:22:

Thanks for the info but any idea how MM behaves ?

Does MM use 993 when “Require SSL” is checked ?
Would that be a “logical” behaviour ?

I have require SSL checked for my provider. A Wireshark capture showed connections to both, but predominantly (like 99% of the captured packets) to 143. A second capture, after quitting and re-starting Mailmate showed connections to 143 only. I feel someone with more expertise could step in here, but I'm going to guess that those 993 connections were connected to certificate(s); and since I started Mailmate and a second capture almost immediately after my first capture, Mailmate's trust of the certificates remained intact, hence no further connections to port 993 were required.
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