Firewall configuration

If your firewall is not the trusting kind, you will need to add a rule that trusts

*.pacerpro.com

Not just www.pacerpro.com; our application uses several servers under the ".pacerpro.com" domain. Also, you should trust email arriving from our mail server

smtp-production.pacerpro.com
o1.smtp-production.pacerpro.com

See also this article for information on how to configure a Mimecast firewall.

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