Recipient Validation: Technical Concepts

Document created by user.oxriBaJeN4 Employee on Sep 9, 2015Last modified by user.Yo2IBgvWqr on Aug 2, 2017
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Recipient validation is the process of checking the recipients(s) of an inbound email to one of your internal domains from an external sender. This check is configured at the domain level and there are the following types to choose from:

 

Inbound Check TypeAdditional RequirementsDescription
Accept Any AddressNoneMimecast accepts messages for any address in the domain.
Send Only DomainA Directory Sync from your company directory to Mimecast is required. Read the Directory Sync Overview page for further details.Mimecast only accepts messages for addresses in the domain that have been synchronized from your local directory.
Known Recipients Only

All users that you want to receive email from, must be added to Mimecast. The first time a user sends an email outbound via Mimecast, a user is created. Users can also be added to Mimecast individually, using a spreadsheet import, or using Directory Sync.

Mimecast only accepts messages for addresses that display when you open the domain. The list is a combination of addresses that are:

  • Synchronized
  • Imported
  • Manually created
  • Sent or received items in the past
Known POP Users Only

Exchange Recipient Filtering must be enabled. See the Enable Exchange Recipient Filtering for SMTP Call Forward page for further details.

Mimecast checks the original "Mail From" address against your Exchange, to ensure the recipient address is part of its Recipient Filtering list. Only messages for addresses that have been verified by your Exchange environment are accepted by Mimecast.

Directory Users OnlyDirectory Sync from your company directory to Mimecast. See the Directory Synchronization page for further details.Mimecast will only accept messages for addresses within the domain that have been synchronized from your local directory.
SMTP Call ForwardExchange Recipient Filtering must be enabled. See the Enable Exchange Recipient Filtering for SMTP Call Forward page for further details.Mimecast contacts your Exchange server using the original "Mail From" address to check if the recipient address is part of the Recipient Filtering list in your Exchange environment. Only messages for addresses that have been verified by your Exchange environment will be accepted by Mimecast.
SMTP Call Forward With <>Exchange Recipient Filtering must be enabled. See the Enable Exchange Recipient Filtering for SMTP Call Forward page for further details.

Mimecast checks the original "Mail From" address against your Exchange using a null sender (<>), to ensure the recipient address is part of its Recipient Filtering list. Only messages for addresses that have been verified by your Exchange environment are accepted by Mimecast.

Act as Backup MXNoneMimecast only accepts messages for the domain (any address) if your mail server is unavailable. A SMTP Call Forward Route is used to determine availability.

 

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