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Delivery & mail flow
NDRs, routing, quotas, and why mail is not arriving.
One auto-reply for 21 mailboxes, not 21 rules
A team wanted one standard reply to every external email across 21 mailboxes — every message, no “Away”, one central sender. The funnel-then-decide design: one mail-flow rule, one flow, and the gotchas that cost time.
Read →The bounce that lied: when "Delivered" isn't delivered
A user's mail kept bouncing while every trace showed Delivered. The full anatomy of email delivery — DNS, SMTP, SPF/DKIM/DMARC.
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