As a general note, may I suggest you read: http://forums.opengoo.org/index.php?topic=3142.msg12146#msg12146
Otherwise, I would still be happy to help, but can you provide me with some basic information:
1) what type of e-mail server do you use for outbound e-mail (i.e. do you run your own server and if so what is it or do you use your ISPs?)
2) what type of web server are you running (i.e. IIS, Apache, or other?)
A good idea is to look at a mail client's smtp settings that you know works.
Obviously don't post any passwords here, but I need at least a basic understanding of the systems your using to be able to help you. If you would feel more comfortable, feel free to PM me with the info.
Also, if need be, let me know and I'll use a translation program to communicate.