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Actions

Actions define what happens to an email message when a policy rule matches. Each action targets a specific aspect of the message - you can block delivery outright, rewrite the subject, manage recipients, manipulate attachments, or add and remove headers. Multiple actions can be combined within a single rule to apply several changes in one pass.

Policy rule actions

Block message​

Block message action allows blocking email messages during SMTP transactions. When a milter decides to block a message, it returns specific response codes to control Postfix's behavior.

For more information, see Block Message.

Modify subject​

Modify the message subject, use one of three available options to modify the subject.

For more information, see Modify subject.

Rewrite subject​

Rewrite the message subject, use regular expressions to replace a part or whole message subject. This action gives more flexibility to change subject than Modify subject action.

For more information, see Rewrite subject.

Add recipient​

Add a new recipient to the message.

For more information, see Add recipient.

Remove recipient​

Remove a recipient from the message.

For more information, see Remove recipient.

Move all recipients to BCC​

Move all recipients of an email message to the Bcc field.

For more information, see Move all recipients to BCC.

Remove attachments by name​

Remove attachments from an email based on their names.

For more information, see Remove attachments by name.

Remove attachments by type​

Remove attachments from an email based on their content type.

For more information, see Remove attachments by type.

Remove attachments by size​

Remove attachments from an email based on their file size.

For more information, see Remove attachments by size.

Compress attachments​

Compress attachments in an email message to reduce their total size.

For more information, see Compress attachments.

Add header​

Add a custom header to an email message.

For more information, see Add header.

Modify header​

Change the value of an existing email header in the message.

For more information, see Modify header.

Remove headers​

Remove specified headers from the message.

For more information, see Remove headers.