Noting or logging account when notification is triggered

One simple solution would it be to create I text Pheobe and enable logging. That is a field property.

Then you could have a form rule to say that when your check box is checked which triggers Email, to write certain words into that text field with logging enabled. When logging is enabled it records the date and who did the update.

That is one simple solution if you just want to make a note of the date that the request was made. There are also a whole range of other solutions depending on your needs.