All, I am having the same issue. I have tried everything mentioned.
I am using gmail account. Server name = smtp.gmail.com
port number 465, Checked the check box "this server requires a secure connection".
Using basic authentication with my test email address and password. Getting error when sending test email:
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 6 (2016-08-24T13:52:31). Exception Message: Cannot send mails to mail server. (Failure sending mail.).
Tried different port number (587) but get different error message:
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 6 (2016-08-24T14:04:57). Exception Message: Could not connect to mail server. (An attempt was made to access a socket in a way forbidden by its access permissions 74.125.25.109:587).
btw using SQL server 2012.
Thanks,
Sean