[EMAIL-3] Harden SPF and DMARC after testing #318
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Part of Epic: #315
Task
After confirming send/receive works, tighten SPF from ~all to -all and DMARC from p=none to p=reject.
Acceptance Criteria
v=spf1 mx a ip4:143.198.27.163 -allv=DMARC1; p=reject; rua=mailto:postmaster@alexanderwhitestone.com