I have installed OS Yosemite 10.10.1 a couple of months ago. Everything was ok especially with mail. However a couple of days ago it just stopped to sending emails with no apparent reason since none configurations changes or updates have been done.
I keep having the following error message every time I try to send an email.
The SMTP connection to server “smtp.gmail.com” failed. Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent.
Obviously I have already checked the username and password but the problem persists.
Could someone help me to fix it please ?
Following Buscar웃 hint at the comment I've gone to 'mail- pref-accounts- edit smtp - advanced - authentication' then selected 'none' instead of 'password' with was previously selected.That way it is working again. What are the consequences of that change? What exactly 'authentication' means in this context? Am I lose security by doing what I did ?