Sometimes you insist on knowing something but will be proven wrong. Taking that and learning form it, which makes the difference between being an old grumpy person and a learning grumpy person.
I happy that I made it yesterday to be the latter:
TL;DR: while port 465 was deprecated in 1998 for smtps, it was refused by RFC8314 for "submissions" which is most people used it for years anyway. Main difference: It's standardised now.
*re-used not refused! Sorry for everyone who didn't read the article.
port 587 love :)
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