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Whitelist Requirements for SMTP Services

In this chapter we have mentioned all the white-list requirements for SMTP services.

Description:

This document describes what to whitelist for successful E-Mail service delivery.

Purpose:

The purpose of this document is to describe the whitelisting requirements for SMTP E-Mail services.

 

DNS Domain Modification:

When an E-mail message is sent by a domain where the sender is different than the SMTP server’s domain, it will report out as a softfail through MIME headers. Some clients prevent E-mails which report a softfail from coming through their SMTP server. To validate the client’s domain as a valid sender for our SMTP servers, thus preventing a softfail, the following DNS modifications are needed:

 

1.      Update domain’s root TXT SPF record by adding: include:_spf.mitracloud.com

 

 

Firewall Filter Rule: 

Some clients restrict incoming traffic with respect to incoming E-mail. These clients require the IP address of our SMTP servers in order to allow access. A new tcp protocol rule for the following addresses may be required:

 

mailod.mitracloud.com

166.78.81.73

US-Only

Prod

maildw.mitracloud.com

98.129.166.181

US-Only

Non-prod

maill3.mitracloud.com

94.236.35.193

UK-Only

Prod

maill5.mitracloud.com

162.13.228.166

UK-Only

Non-prod