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Comment by threeio

15 days ago

I have a 3 character .com as my primary email... it gets rejected more often than I'd like... including at my bank :) I've got a longer more normal domain that I alias, but it annoys me none the less.

Have you got this lot sorted out:

  MX->A->PTR->A->MX
  SPF
  DKIM
  DMARC
  mta-sts - DNS and webpage

Also your IPs must be squeaky bum clean, ideally for several years. DNSSEC might help too. In the UK getting as far as DKIM is usually enough (plus clean IPs, even FTTC connections will work if static).