Hello & Welcome to JustAnswer
Where do you want to update the password?
On the mac mail client?
Open Mac Mail
Click Mail -> Preferences
Select your account from the left pane
then edit the password ***** with the new password
then under outgoing smtp section, select edit smtp server list
click the advanced tab
select your smtp server from the list of servers
and delete the previous password, type the new one
click ok, cross it and save it.
Let me know if that works
Splendid- it is reset.
Thank you :)