An example of relaying email would be logging in to ISP "A" and then using a mail reader at ISP "B" to try and send email. ISP "B" will notice you are not logged in to them and refuse to send email.
If you are off-campus and try to use an email client other than webmail (Thunderbird, Outlook, etc.) to sned an email from your TCC account ("@nmt.edu"), then you will need to have your smtp settings configured to authenticate. Use TLS or STARTTLS to provide encryption so that your TCC password is not sent as plain text.
From Schlake, Thu Jun 03 07:50:38 2004
Mail clients are all different, but somewhere in the preferences for the SMTP server there will be a checkbox that says something similar to use AUTH (select this option), and another checkbox that says something similar to TLS or STARTTLS, possibly with options: never, when available, or always. The always option should be selected if that option is provided.
-- William Colburn, "Sysprog" <wcolburn@nmt.edu> Computer Center, New Mexico Institute of Mining and Technology http://infohost.nmt.edu/tcc/ http://www.nmt.edu/~wcolburn