Mimecast: Configure to allow Mailing List emails.
Mimecast specializes in email security for Microsoft Exchange and Microsoft Office 365.
Why Emails are Blocked
Mailing Lists are a special challenge for software that is trying to stop spam and malware.
Traditionally, Mailing Lists keep the original message sender in the From: header. However, the email is sent from the Mailing List server, not from the original sender's ISP.
Some anti-spam settings will reject emails for this reason.
Mimecast Details
NOTE:
Mimecast is complicated. There are many places within Mimecast to set policies.
Two options to set up a policy allowing Mailing List emails are described below.
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Option 1
- Navigate to the Gateway / Policies Tab.
- The policy needs to be created in the “Permitted Senders” category, to allow receipt from your bulk mail provider.
- Add Mail-List.com's IP addresses to the "Source IP Ranges" field.
Mail-list.com IP addresses: http://www.mail-list.com/whitelist
See example below to create a new policy:
![](https://media.screensteps.com/image_assets/assets/004/032/744/original/c44ab582-d718-4bcc-828d-799d9b5e29f9.png)
Option 2
See another example below to create a new policy. This is different way of accomplishing the same result as above.
![](https://media.screensteps.com/image_assets/assets/004/032/746/original/413a375a-22ec-482a-9208-48823e8d5043.jpg)