What is envelope-from vs header-from? A Plain-English Guide
The envelope-from (Return-Path) is used for SPF and bounces; the header-from is what recipients see. DMARC checks alignment between the header-from and the authenticated domain.
Why it matters for deliverability
Understanding envelope-from vs header-from is part of understanding which From matters. Get it right and more of your mail reaches the inbox; get it wrong and even legitimate mail can be filtered.
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How Rainmail helps
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