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Best email provider against spam?
(lemy.lol)
This is a most excellent place for technology news and articles.
I've found that you're fine as long as you pass all the SPF/DKIM steps, have an SSL cert and use your ISP's mail relay.
The biggest issue I face is that occasionally a legit mail server refuses to support SSL/TLS and my server drops the connection. The other 99% of unencrypted mail is spam.