Mail server IP ranges

If you send an email to a group of people at a company, or, if contacts on your list are using the same domain as your “From” email address, it's possible that your communication will not be accepted by the company's email firewall.

In order to get your messages into the inboxes of these contacts, we recommend working with their IT team to add the IP ranges listed below to a safe sender list.

CIDR Start of range End of range
173.236.20.0/24 173.236.20.2 173.236.20.254
192.92.97.0/24 192.92.97.2 192.92.97.254
52.128.40.0/21
52.128.40.0
 52.128.47.255
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