You can manage your own list of email addresses in Outlook using Mimecast Plugin.

This plugin helps to block, permit, and manage automatically allowed addresses.

To install Mimecast for Outlook, download 64-Bit Client from this location: https://community.mimecast.com/s/mimecast-for-outlook

To open Mimecast Managed sender’s view from Outlook application:

1. Open Outlook and click on the Mimecast ribbon in the Home page

2.    Click on Managed Senders

There are 3 different list in managed senders and they can be managed separately by selecting each list.

1. Blocked: The emails from addresses that you suspect as spam or with malicious links can be manually added to this list
2. Permitted: Emails from external domains that you trust can be added to permitted senders list (these emails will bypass spam checks in the future so make sure these are emails from trusted third parties)
3. Auto-Permitted: Automatically allowed addresses are added to your ‘Auto-Permitted list’ each time an email is sent from your address to a new external domain. Mimecast remembers these addresses so that spam checks are bypassed from the next time an email originates from them.

NOTE: If you find one of those addresses in auto-permitted list cannot be trusted anymore because of some potential cyber risk in the third party organization then promptly remove/block the address from your Auto Permitted Senders list.

The following actions can be performed from the Managed Senders window:

Adding a Permitted Sender

To add a senders address to the permitted senders list:

1. Click on Permitted from the managed senders list
2. Click on the + button on the top right corner to add permitted addresses
3. Add email address or the domain(eg: domainname.com) to the text box
4. Click on Permit button

Removing/Blocking a Permitted Sender

To remove an address from your permitted senders list:

1. Click on the Permitted from the managed senders list
2. Click on Show actions icon to the right of senders address
3. Click on Remove or Block

Adding a Blocked Sender

To add a sender address to the blocked senders list:

1. Click on Blocked from the managed senders list
2. Click on the + button on the top right corner to block an address
3. Add the email address or the domain in the text field.
4. Click on Block button

Permitting a Blocked Sender

This is useful in scenarios where you have identified that one of the trusted email addresses which should be permitted is present in your blocked senders list.

Follow the below steps to remove an address from blocked sender list and add it to your permitted senders list:

1. Click on Blocked from the managed senders list
2. Click on Show actions icon to the right of senders address.
3. Click on Permit Button

Removing a Blocked Sender

Always keep track of your blocked senders list. This functionality is useful if you have accidentally added a sender’s address to the blocked senders list and want to remove it. So that the emails from that sender reaches your inbox.

NOTE: Please try this as a first step if you find difficulty in receiving emails from a specific sender or domain address. If it doesn't work then please email IT team/ create an IT support ticket.

1. Click on Blocked from the managed senders list
2. Click on Show actions icon to the right of senders address
3. Click on Remove button

Removing/Blocking an Auto Permitted Sender

To remove a sender's address or domain from your auto permitted senders list:

1. Click on Auto-Permitted from the managed senders list
2. Click on Show actions icon to the right of senders address
3. Click on Remove or Block button