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Fix a failing sender

Mail is bouncing or landing in spam. Work the causes in order of likelihood.

3 steps

  1. Read the failureWhat the report is telling you about the sender.Step 1 of 3
  2. Check DKIM alignmentA valid signature can still fail DMARC on alignment.Step 2 of 3
  3. Body-hash failuresWhen something in transit rewrote the message.Step 3 of 3