error on sendmail()

 
i've got this message in Journal Tab

18:35:47 Mail: 530 5.7.0 Must issue a STARTTLS command first p20sm12531042nfc
18:35:47 Mail: 'Test message' failed

what dose this mean?

thnx
 
What Mail Server are you using?

I have tested with http://www.softstack.com/freesmtp.html and it is works very well. It is simple, fast and free.

Good luck!
Reason: