We use an MTA which supports STARTTLS, sending the message data
through an encrypted channel for servers which support it (like
Google).
Thank you for enabling opportunistic STARTTLS - you've stepped up the
game for both yourself and possible clients. However, it is not
something that will mitigate the Gmail deferrals. We have been using
this for years and still have deferrals every now and then.
FWIW, the cipher our MTA negotiates with Gmail:
mta tls ciphers=TLSv1.3:TLS_AES_256_GCM_SHA384:256
So either the switch has reset some internal counter at Gmail or you
have been lucky when the queue was delivered.
-Jeroen
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