If you'r facing a Problem sending from outlook while connected via Egyptian ISP, TEDATA. Here is the solution:
In outlook, replace your corporate SMTP with "smtp.tedata.net.eg". This shall work but I found that this outgoing mail server has got some problems. Mainly I found that my email reaches its destination very late (sometimes it took days) so I talked to customer service for another solution and they advised me to use “out.tedata.net.eg” for SMTP. However, this server requires authentication. The username and password are the same as the id and password of the free email given with TEDATA DSL subscription. If you haven't got such credentials contact TEDATA sales at 19777 so they will create a mailbox for you and give you the credentials.