On 10 Apr 2022, Gaston Martres said the following...
GM> For other smtp servers and mail providers it is not enough just using
GM> TLS. You will have to configure DKIM keys and dns entries, SPF entries
GM> as well, a reverse dns pointing to your mail server, a good reputation
GM> on RBL lists, and so on.
Yes, e-mail nowadays appears to be an exercise in technology, that's for sure...
Best regards
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