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Mail flow
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2026
Project
1 June 2026
3 min read
Proofpoint in front of Exchange Online: what a mail gateway migration really costs
Phishing and impersonation were reaching inboxes, so the company put a dedicated gateway in front of Exchange Online. Changing an MX record takes five minutes. The three inventories that have to exist before anyone touches it took months, and they are the part worth writing down while the migration is still under way.