Gateway Policy Types

Gateway Policies allow an Administrator to apply granular control to the flow of email messages as they are processed by Mimecast. They are:

A set of rules that affect the flow of email traffic.
Applied to either inbound or outbound messages.

There are a number of policy types, each of which has a specific purpose as outlined below. Each policy has a set of options. Some policies allow more specific settings to be configured by use of a separately configured definition. Where this is the case, the table below states this.

The policies available to you, depends on the Mimecast product you've purchased.

Policy TypeDefinition Required?Description

Address Alterations	Yes	Modifies the email addresses of inbound or outbound messages as they are processed ,based on the either the sender / recipient email address or header / envelope information.
Address Alterations Bypass	No	Overrides an existing Address Alterations Policy.
Anti-Spoofing	No	Blocks unwanted inbound spoofed emails.
Anti-Spoofing SPF Based Bypass	No	Ensures your internal users can still receive communication sent by a trusted third party on your behalf.
Attachment Block on Size	No	Blocks delivery of attachments over a specific file size. The recipient receives only the email body, with a message informing them of the attachment's removal.
Attachment Hold on Size	No	Places delivery of messages with attachments over a specific file size, on the Administrator On Hold queue. The recipient receives a notification to this effect.
Attachment Link on Size	No	Strips an attachment from an email if it exceeds a specified size. The recipient receives only the email body, with a notification containing a link that allows them to download the attachments.
Attachment Management	Yes	Provides a list of attachments that can be used to configure what attachment types should be allowed, blocked, linked or held.
Attachment Management Bypass	No	Overrides an existing Attachment Block on Size, Attachment Link on Size, or Attachment Management policy.
Auto Allow	No	Overrides emails from users listed in the Auto Allow database from being subjected to the typical IP reputation and spam checks. Instead they are only scanned for viruses.
Auto Allow Creation	No	Creates exceptions for an Auto Allow policy.
Auto Response	Yes	Automatically issues a response to the senders of inbound emails to Mimecast.
AV Scan on Release	No	Rescans a held email for spam and viruses after it has been released by either the Administrator or a user.
Block Senders	No	Restricts messages to or from specific email addresses or domains.
Closed Circuit Messaging	No	Allows internal users to send confidential messages to external recipients. Instead of sending the email to the recipient's mail server, the recipient can view and respond using Mimecast Personal Portal (MPP), or Mimecast Services for Outlook (MSO).
Content Examination	Yes	Prevents email delivery by specifying what content to look for, and what action should be taken if a match is found. Matches emails are sent to the Held queue. Additionally notifications can be sent for specific senders / recipients or groups of users.
Content Examination Bypass	Yes	Ensures certain users, groups or domains are not subjected to a particular Content Examination Policy.
Content Overseers	No	Configures a group of users to review, release, or reject held emails.
Content Preservation (Days)	No	Decrease the retention period of particular messages (in days) to a value less than your Maximum Account Retention.
Content Preservation (Minutes)	No	Decrease the retention period of particular messages (in minutes) to a value less than your Maximum Account Retention.
Delivery Routing	Yes	Specifies the route used to deliver emails to and from Mimecast, including details of the delivery destination (e.g. the Host Name or IP Address of the email server).
Digest Sets	Yes	Configures email notifications that give the end user direct control over emails that have been quarantined by Mimecast security policies.
Disclaimer Assignment	Yes	Controls if and when to assign a disclaimer to an email, by applying a Stationery Layout. This policy is only available if you have not purchased the Stationery module. If you have the Stationery module, this functionality is provided by the Stationery policy type.
DNS Authentication	Yes	Controls the types of email authentication checks that are performed when Mimecast receives an email.
Document Services	Yes	Strips revision information from documents, including document properties, author credentials, tracked changes, comments, and Microsoft Visual Basic for Applications macros.
Document Services Bypass	No	Ensures certain users, groups or domains are not subjected to a particular Content Examination policy.
Email Alteration Bypass	No	Ensures that email is never altered by a Stationery Layout, Address Alteration, Attachment Link on Size, Document Services, or Scan Settings Policy policy.
Email Size Limits	No	Sets an email size limits for both inbound and outbound emails. Any emails exceeding the specified size will be rejected.
Forwarding Address	Yes	Sets a rule that an email from / to specific email addresses are not delivered to the original recipient, but delivered to an alternate address.
Greylisting	No	Allows you to receive emails from legitimate senders, whose Message Transfer Agent has not been correctly configured.
Group Carbon Copy	No	Enables individuals or Groups to be blind copied on emails.
Message Actions	No	Allows Mimecast for Outlook or Mimecast for Mac users to control the way emails are sent.
Message Passthrough	No	Bypasses Mimecast's data optimization activities whereby the message content is exploded, or attachments saved under the single instance storage mechanism. Instead emails are delivered as the original raw file.
Message Sanitization Bypass	No	Bypasses the checks made to ensure a message structure conforms to RFC standards.
Metadata Preservation (Days)	No	Limits the life of message metadata (in days) to a value less than your company's maximum account retention period.
Metadata Preservation (Minutes)	No	Limits the life of message metadata (in minutes) to a value less than your company's maximum account retention period.
Notification Sets	Yes	Controls the system notifications generated for certain email delivery events.
Permanent MX Resolution Failures	No	Allows administrators to specify a threshold of delivery attempts. After the threshold is reached, an outbound message should be hard bounced if the MX resolution performed by the Mimecast Message Transfer Agent (MTA) results in a permanent failure.
Permitted Senders	No	Ensures inbound emails bypass security checks (reputation and spam checks) but not virus checks. Emails are delivered directly to internal recipients, without the risk of the message being rejected or placed in the Held queue.
Reputation Policy	Yes	Specifies the reputation checks applied to Inbound emails.
Secure Delivery	Yes	Specifies how Transport Layer Security (TLS) technology is used to protect confidentiality and data integrity, thereby ensuring emails are transmitted through an SSL encrypted tunnel.
Secure Messaging	Yes	Secure Messaging allows internal users to transmit confidential messages to external recipients.
Secure Messaging Bypass	No	Disables secure messaging functionality that allows internal users to transmit confidential messages to external recipients.
Secure Receipt	No	Specifies how emails form a sender are received by Mimecast using Transport Layer Security (TLS).
Sieve Sub-Address	No	Bypasses the check to reject inbound emails where the internal recipient address holds a Sieve Sub extension.
Smart Tag Assignment	No	Links emails to Smart Tags based on the sender and recipient details.
Smart Tag Bypass – Administrative	No	Overrides a Smart Tag Assignment policy.
Smart Tag Bypass - Personal	No	Overrides a Smart Tag Assignment policy.
Spam Scanning	Yes	Configures spam scanning to check the content of all inbound emails. Spam Scanning can be configured to apply to different levels of sensitivity and actions, should the policy be triggered.
Stationery	Yes	Controls if and when to apply Stationery to an email.
Stationery Exclusion	No	Bypasses an existing Stationery policy.
Suspected Malware	Yes	Provides protection against previously unknown threats.
Suspected Malware Bypass	No	Bypasses an existing Suspected Malware policy.
Targeted Threat Protect - Attachment Protect	Yes	Controls whether email attachments are safe, and how the recipient can access them.
Targeted Threat Protect - Attachment Protect Bypass	No	Bypasses an existing Targeted Threat Protection - Attachment Protect policy.
Ta Choose files or drag and drop files Tags: Was this article helpful? Yes No Carlos Rios Posted Tweet Share on Facebook Comments Comments are disabled for this article Related articles Top 10 Common Questions - Mimecast Allow / Deny List (Managed Senders) Order of Operations - Mimecast Top 10 Implementation Questions - Mimecast Troubleshoot Email Delivery - Mimecast The Gateway Policy Editor Connect Process - 3b. Setting up Your Outbound Email

Gateway Policy Types

Carlos Rios

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