How To – Mimecast
Add external email as safe sender
A. Add via Users & Groups
2. Click on Administration Console.
3. On left side select “Users & Groups”
4. Select “Profile Groups”
5. On Edit Group Root select Permitted Sender List then click on Build > click on Add Email Addresses.
6. Type or paste the email address in Group Additions box and Add a note if you want.
7. The email will be added into Black list sender group.
B. Add via Managed Senders
1. On Mimecast Administration Console. Select Email Delivery tab on left side.
2. Select Managed Senders.
3. To add new email select Add > Add Managed Senders
4. Fill in the Managed Senders Selection details such as Sender Address, To Address and what action to be taken either PERMIT or BLOCK.
5. Try to search the sender email and it should appear as Trusted sender