Issue Summary

When using a text that includes the dash character "-" in the custom signature detection the incoming emails that have a signature that match this filter, will not be properly processed. Instead of hiding the signature, the content will be stripped.

Steps to Reproduce

1. Add a text that includes the dash character "-" in the custom signature detection, for example, a phone number: 1-234-5678

Expected Results

The signature will be hidden when an incoming email has a signature that matches the given filter.

Actual Results

The signature will is being stripped when an incoming email has a signature that matches the given filter.

Workaround

Identify another filter that can be used to detect the signatures instead of text that includes the dash "-" character.