Mail connection to mail server

I'm using iMac running Snow Leopard. On Mail application I have 5 e-mail accounts. On some accounts and often get exclamation mark and it will disappear when I run Mail Connection Doctor. After a few minutes, the exclamation mark appears again.
Please advice. Thanks

DougMH wrote:
I'm trying to connect to the smtp mail server run on my web application host (mail.hhraweb.com).  I can't seem to get to it anymore on port 25
c:\users\dad>telnet mail.hhraweb.com 25
Connecting To mail.hhraweb.com...Could not open connection to the host, on port
25: Connect failed
My ? is, is Verizon blocking access to other mail servers on port 25?
{edited for privacy}
Yes. http://www.verizon.net/port25
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