Issue Summary

When editing and saving a rule that contains a "Send customized email" action, the message "Please provide a valid value" can appear in the "Customize email address" field.

Steps to Reproduce

1. Edit an existing rule that contains a "Send customized email" action.
2. Try to save the rule.

Expected Results

The rule should be saved without errors.

Actual Results

You will see the message on the UI:

"Please provide a valid value" 

Workaround

Usually, the value on the "Customize email address" is automation. Add an extra character like automation1, remove it and try to save the rule again. 

Note: you might need to do it on all actions on the same rule.