For some inexplicable reason my secondary email address will not send but does receive emails.  I am using Windows Live - 2012 on a Windows 7 operating system.  I am getting the following error messaging (I masked the address referenced in the message):

The message could not be sent because the server rejected the sender's email address. The sender's email address was *** Email address is removed for privacy ***'.

Subject 'Re: Rock Bottom RSVP'
Server Error: 530
Server Response: 530 5.7.0 Must issue a STARTTLS command first. g78sm5028433ioi.41 - gsmtp
Server: 'smtp.gmail.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): No

The settings are the same as my primary email address which is functioning correctly.  This includes checking the box found in the Servers tab for the outgoing mail server, "My Server Requires Authentication" and when clicking the Settings button in the Servers tab checking the box "My Server Requires Authentication".  The google password for this account was changed in case it may have been hacked.  Still no luck.  Any suggestions?