I am on Mavericks version 10.9.3 I never had any of the mail issues others had because my one school gmail account is used very basic (just inbox and occasional sending). However I just now I went to send an email to my professor and and I get a notice that mail cannot connect to the account and makes me re-enter my email password. I entered it three times and it came back as incorrect all three times. I gave up and just logged into the web interface to send it, but I don't get this issue. It works fine on iOS, worked fine before, I still receive messages fine on the Mail.app, but it won't let me send. I thought they were suppose to have fixed these issues in a past update . I deleted and re-entered the account in settings, but it didn't work. Any ideas?