We've noticed this a few times - mainly as the customer we are working with, 2 of the customer contacts are no longer working with our project - and dont need to be included.

Scenario:

A ticket has been created by emailing our dedicated support address.

Follow-on Replies have more recipients added to them as required.

After a specific reply - It is noted that these 2 people should not be included in future updates - so they are removed manually from the recipient list before the reply is sent.

When the time came to needing to reply again - selecting reply in the ticket - those 2 email addresses were in the recipient list again.

What is the correct / designed behaviour here?

If hitting Reply on the last reply in the ticket - it should just include whoever was in the last Reply?

or

does it default to including everyone in the first reply to the ticket

or

something else?