I began using dyndns's various SMTP services for personal Email many years ago when I was a Comcast customer and Comcast was outsourcing their Email services through AT&T, and AT&T's MTAs were being blocked by many of my intended recipients as the bulk of their output was untrapped and unfiltered spam. I continue to use their SMTP services today because they manage MX DNS records and forward incoming mail to me.
(My current home ISP is AT&T, and their Email that I don't use is outsourced to Yahoo.)
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