Envelope-from is the hidden sender address used during SMTP. Learn how it differs from From and why it matters for SPF and bounces.
Envelope-from is the sender address used during SMTP delivery. It’s often not the same as the visible From header, and it’s where bounces are returned.
SPF checks usually evaluate the envelope-from domain, which is why it influences SPF alignment under DMARC. Keeping envelope-from aligned helps prevent DMARC failures.