Mail errors · Gmail

What does “550 5.7.1 The IP you're using to send email is not authorized to send email directly to our servers” mean?

The message came straight from an address Gmail does not accept mail from, often a home or office internet line.

Last read from the sources at the foot of this page.

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Gmail bounce
Mail Delivery Subsystem
550 5.7.1

The IP you're using to send email is not authorized to send email directly to our servers

As Gmail prints it.
01

What does it mean?

Some addresses are meant for browsing, not for running a mail server. Gmail refuses mail sent straight from them.

02

What exactly does the source say?

550 5.7.1 The IP you're using to send email is not authorized to send email directly to our servers. Use the SMTP relay at your service provider instead.

Gmail's page writes domain-name and ip-address where your bounce shows your own domain and the sending address.

03

Why would a small firm see it?

A printer, a server in the office or a program set to deliver mail itself instead of handing it to the mail provider.

04

How do I fix it?

  1. Find the device or program that sent the message.
  2. Set it to send through your mail provider with a username and password.
  3. Make sure that provider is in your SPF record.
Sources

Where does this come from?

Related
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