Account settings -> Fetching mail -> Incoming server
Account settings -> Sending mail -> Outgoing server
And wow, forced password rotation every 30 days? That's crazy, and probably counterproductive. Current best-practice guidelines suggest only rotating passwords when there is an actual account compromise. If you can, point your IT people to the NIST guidelines, section
5.1.1.2:
https://pages.nist.gov/800-63-3/sp800-63b.html
The important quote:
> Verifiers SHOULD NOT require memorized secrets to be changed arbitrarily (e.g., periodically). However, verifiers SHALL force a change if there is evidence of compromise of the authenticator.
--Sean