Can not send emails in Outlook 2007-Windows Vista user

[Marilisa writing from Canada]

I keep getting the error code "Task (e-mail address removed) send error code
OX80042109 . Outlook cannot connect to your outgoing smtp server." The other
account I use in Outlook requires "secure password authentication (SPA)" and
I think this has something to do with why I can only receive messages from
this account but not send. I have checked all my network settings and my
account is set up properly. I have spoken with eastlink at least 4 times and
they think it is a firewall issue but I don't know how to fix it if this is
the case. I have Windows Vista and I use Windows Live Onecare as my virus
protection. Can anyone help me, I am very frustrated at this point and there
is nothing on this site taht seems to be able to help me. Thank you to anyone
in advance for their assistance.

 

[Marilisa writing from Canada]

Thank you for the reply. I am confused as to what you mean when you tell me
to telnet the SMTP mail host. I don't know how to do this.
In any case, I am sure this is an Outlook issue because I can send emails
from windows mail with no problems and it is received with no problems. To
answer a few of your questions, thisnproblem began at least 1 month ago and
it was working fine prior to that. If I can send emails using
(e-mail address removed) through windows mail without disabling any firewalls or
changing any settings, what tests do I need to do to find out why Outlook is
not allowing me to send any emails from that account? Thank you and I look
forward to a response as you seem knowledgeable regarding Outlook issues.
Thank you.
Marilisa