SMTP email settings?

[GlueGuy]

Having trouble getting email set up correctly. If I use my yahoo account, it works as I would expect.

However, when I use our company SMTP server, I get the following error:

Sending Message...

ERROR: SMTP Host does not appear to support authenication: 503 AUTH command used when not advertised
SMTP Host does not appear to support authenication: 503 AUTH command used when not advertised

I know that this server does support authentication, so there must be some setting or switch that I must use to send the correct SMTP commands (or something).

I don't know enough about SMTP to articulate this correctly, so if someone that has a clue could point me in the right direction?

I tried connecting to the SMTP server with telnet, and the conversation went something like this:

telnet <mysmtpserver> 25
Trying 65..............
Connected to <mysmtpserver> (65..............).
Escape character is '^]'.
220 ESMTP Wed, 21 May 2008 13:45:50 -0400: UCE strictly prohibited
HELP
214-Commands supported:
214 AUTH STARTTLS HELO EHLO MAIL RCPT DATA NOOP QUIT RSET HELP
AUTH
503 AUTH command used when not advertised

Is there another way to pass the authentication credentials that I can control with a switch or something?

Postscript:

I have gotten to the point that I've determined that our email server requires TLS. Can anyone advise me on what switches I need to flip to tell Cacti to use TLS?

[GlueGuy]

I'm going to reply to my own post, because this is an SMTP issue with regard to a(n) SMTP server that requires TLS.

Does anyone know how to force TLS when setting up email in Cacti? ... or any email client for that matter?