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Email bounced because IP address is blacklisted

On rare occasions, you might send mail from your Gmail account, and then receive a notice that your mail has bounced because your IP address has been blacklisted by the recipient.

How can I fix this problem?

This is likely a temporary problem that happens only with some recipients. One option is to simply wait until the problem goes away. Otherwise, ask the recipient to add your domain name to their Approved Sender's list. If their mail service doesn't support approved senders, ask them to whitelist (approve) Gmail's sending IP addresses. After they do either of these things, mail will no longer bounce from that recipient.

Show me Gmail IP addresses to whitelist

Ask the the recipient domain's IT administrator to add the following Gmail IP addresses to their Simple Mail Transfer Protocol (SMTP) gateway's whitelist:

64.18.0.0/20
64.233.160.0/19
66.102.0.0/20
66.249.80.0/20
72.14.192.0/18
74.125.0.0/16
108.177.8.0/21
172.217.0.0/19 
173.194.0.0/16
207.126.144.0/20
209.85.128.0/17
216.58.192.0/19
216.239.32.0/19
2001:4860:4000::/36
2404:6800:4000::/36
2607:f8b0:4000::/36
2800:3f0:4000::/36
2a00:1450:4000::/36
2c0f:fb50:4000::/36

Why is this happening?

Some domains might use a Realtime Blacklist (RBL) service to identify and block mail from suspected spammers. If enough of those domains' users mark mail received from a particular IP address as spam, the RBL can blacklist that address, blocking all mail from it. If your mail is being bounced, it's possible that an RBL service has blacklisted your domain's IP address.

What does Google do about this?

Google is regularly in touch with RBL services to ask that they delist our IP addresses if they get blacklisted. However, because we can't prevent RBL services from blacklisting any of our IP addresses, nor guarantee the removal of them, Google support doesn't accept requests to delist blacklisted addresses. 

My domain doesn't send spam

Gmail sends mail from a number of different IP addresses that shift regularly. If one of your messages goes out from an IP address that was blacklisted after someone else used it to send spam, your mail can start getting bounced. Mail bounces only from recipients who use the RBL that blacklisted the IP address, and only while the address remains blacklisted. Eventually, the RBL delists your IP address, or Gmail assigns you another sending address, and your mail no longer bounces.

My domain does send spam

In that case, we ask that you stop doing so from your Gmail account.

Contact G Suite support

If you have additional questions or concerns, contact G Suite support.

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