At first when choosing an appropriate processing rule Advanced Email Parser checks whether the email corresponds to the rule filter. If the incoming email conforms to the filter, this rule will be used for its processing. Otherwise AEP will check the next rule.
If the rule lacks filters, it will process ALL incoming/outcoming email.
The searching order of email processing rules corresponds to the rule order in the rule constructor.

Advanced Email Parser will check the email against filters in Rule 1, then Rule 2, etc, until the executable rule is found.
This is Important!
If the filter corresponds to the processed email and this rule has no Continue With Next Rule flag, AEP will stop searching for the next rule regardless the previous rule results.
If the email can be processed by more than one rule, you should set the Continue With Next Rule flag on.