Znači koristim Gmail preko Mail appa na OS-X u, ali više ne mogu slat mailove, samo primat.. pojavljuje se poruka "mail can't verify the identity of smtp.gmail.com", tražio sam po netu ali nigdje nema konkretno riješenje, napravio sam ponovo account u Mailu, upisao sve podatke, ali opet se pojavljuje isti error.. ?

probaj koristiti imap.gmail.com

također provjeri da ti je port za outgoing podešen na 995 i da imaš SSL opciju uključenu (checked). Vjerojatno će ti iskočiti View Certificate prozor. Samo odaberi i prihvati opciju "always trust this certificate"

Port je bio na 993, sad je na 995 ali opet sve isto.. outgoing server ne može biti imap jer je to za dolaznu poštu... baš ne kužim u čemu je problem.. idem na gmail online i podesim Mail po njihovim uputstvima i opet isto...

Uh.. mjesec dana se zezam s tim i vidim da puno ljudi ima problema.. ugl. evo riješenja:
" I was having this problem this morning. For me, the solution was to open the SMTP settings for my GMAIL account in Apple Mail, delete the Gmail SMTP server, then click the add button and make a new one. Then, save changes, quit Apple Mail, run it again, and open something from the Outbox and click send again. It's begun working again. I'm not sure what the change was... I'm assuming it was some corruption of the settings in Apple Mail combined with some change in the stringency of Gmail that prevented them from working together?"

Anyway, the new settings I used were:
server: smtp.gmail.com
(Advanced)
Use Default Ports
Check Use SSL
Authentication: Password
UserName: Ova e-mail adresa je zaštićena od spam robota, nije vidljiva ako ste isključili JavaScript
Password: Your gmail password.

Tj, treba staviti da je Autentikacija - Password i označiti da upotrebljava Default portove.