Used to check if the string is contained in a specified message part.

Note to users of previous versions

This filter combines the capabilities of the following filters in previous versions of AEP: Subject Filter, Sender Name Filter, Sender Email Filter, Recipient Name Filter, Recipient Email Filter, Header Filed Filter.
These filters are converted into the Message Filter, if you are upgrading your old configuration or import rules from previous versions of the program.

Source

Message part in where AEP search the sting. Available parts:
Subject, Sender Email, Sender Name, Recipient Name, Recipient Email, Header filed and Custom Variable.

Header filed can be any of message headers. For example X-Forwarded-For. Value is a case-insensitive.

Custom Variable - any of variables from Global Variables list

Search string

String that filter will look in this part of the message

Whole String

Message part is checked for being completely the same as the filter string.

Match Case

Case-sensitive string comparison.

Use Wildcards

Search string contains wildcards. Supported follow wildcards: * and ?

Use Regular Expressions

Search string contains regular expression.

Result Action

Determines the result of the filter.

Pass Message - if search string found filter allows processing of the message by this rule.
Decline Message - if search string found filter denied processing of the message by this rule.