This post was split from topic:
One of the Zaps that has been working for over a year suddenly stopped responding and asking to log into the STMP credentials. I have logged back in as I would any other zap credential and getting the error message below. I am not sure what else I can do. Any advise would greatly be appreciated.
We use port 587 and I logged in with my company credentials similar to the past. Used the same Host address.