this is almost certainly a misconfiguration in Outlook --
be very carefull and compair to anyother email reader you migh be using.
there are TWO halves to email; the POP server for reading and the SMTP
server for SENDING. They frequently are different!
(which one are you using?)
if you have an antivirus product that scans email, then it can be VERY different
but get straight access to your ISP working first.
typical settings look like
- reading; port 110; pop.$somedomain.com
- sending; port 25; smtp.$somedomain.com
email scanners typically use a PROXY setup which operates like this;
outlook <---->proxy<--->your-isp
review your accounts (tools->accounts->properties->server tab)
if you see an address like 127.0.0.1, then your antivirus proxy has been
configured; RECORD ALL THE INFORMATION for latter.
replace the ip-addresses per the settings required by your ISP
under the ADVANCED tab, record the port numbers.
use the port numbers shown above OR those required by your ISP