View source for Proofpoint IP Addresses

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== Proofpoint Inbound Mail (to customer) ==
For SMTP Connections only. Must use port 25.

IPv4 Subnets:

* US Region:
** 208.56.1.0/25
** 67.231.152.0/24
** 67.231.153.0/24
** 67.231.154.0/24
** 67.231.155.0/24
** 67.231.156.0/24
** 67.231.144.0/24
** 67.231.145.0/24
** 67.231.146.0/24
** 67.231.147.0/24
** 67.231.148.0/24
** 67.231.149.0/24
** 148.163.128.0/19

== Proofpoint Essentials Email Archive ==
For IMAP Connections only. Must use port 993.

IPv4 Subnets:

* US Region:
** 34.192.199.2/32
** 52.55.243.18/32
** 52.54.85.198/32