Setup guides

Fix "5.7.60 Client does not have permissions to send as this sender" and "554 5.2.252 SendAsDenied"

Both errors mean the device signed in as one mailbox but put a different address in the From line. Exchange Online only allows that with Send As permission.

Fix 1: make the From address match

Set the device's sender or "From" address to the same mailbox it logs in with. Many copiers have a separate "device email address" field that must match.

Fix 2: grant Send As

Connect-ExchangeOnline
Add-RecipientPermission -Identity frontdesk@yourdomain.com -Trustee scanner@yourdomain.com -AccessRights SendAs

With SMTPKeep

SMTPKeep sends as the mailbox you set for each device and, by default, rewrites the From address to that mailbox while keeping the original address as Reply-To. Devices with a fixed or odd sender address, such as scanner@printer.local, send without Send As errors.