I'm not really an OE person, but make sure you have the correct address in the accounts setup for both incoming and outgoing.
I don't know what Windows version you are using, but do a search for a
hosts file, and if you find one with no extension, not hosts.sam or lmhosts.sam, open it in Notepad and see if there are any entries there for your mail account address and remove them.
If you can't tell, just rename the whole file
ghosts -- it is not required.
Since this is a secure sockets layer you are having the problem with, you will need to troubleshoot that as well.
Again, knowing the OS would help here:
http://www.mvps.org/inetexplorer/ans...m#secure_sites
for XP
http://support.microsoft.com/?kbid=813444
If the problem persists, check with your ISP to see if they are having problems with their server. They should also be able to ensure you are configured correctly.