In the Gmail Pack the sendEmail() action has an optional “from” field that leads me to believe the email address a message is sent from can be assigned via formula, but no matter what I do I can’t see to get it to work.
Has anyone been able to make it work? Heres a screenshot:
Rather sure you tried it already, but did you try to re-connect the pack?
It’s a rather long time ago, I have used it, but I remember that in the past, when re-connecting the Gmail pack it started to work.
Otherwise I am sure that the support team will be glad to help you to troubleshoot