Not only will email be marked as spam as it currently does with no
validation, mail will flat out BOUNCE and be marked as undeliverable:
"Gmail and Yahoo will now require - SPF, DKIM, and DMARC.
Unauthenticated emails may be bounced with a 5.7.26 err...
After reading this issue comment thread, we are actively looking for a
replacement to SS at this point. If this hasn't been resolved at this
point, 7 years from it appearing, it never will be. In our experience,
companies who don't fix the issue or d...
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