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Step-by-step: fix “email sent as another user” using Google Workspace SMTP Relay + PostMaster
Published: 01-11-2025

A) Google Workspace (Admin Console) — set up SMTP Relay Open: Admin Console → Apps → Google Workspace → Gmail → Routing → SMTP relay service → Add ...

Google Workspace Gmail SMTP relay smtp-relay.gmail.com PostMaster mail gateway smart host STARTTLS TLS port 587 port 465 Outlook app password envelope sender Return-Path From header Reply-To sender masking SMTP sender masking IP allowli
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