Outgoing Mail Error

I am using Witribe Internet connection and facing difficulty in sending mails to Hotmail yahoo and other accounts while mails on other email Like ( name@website.com) have no issue..

I am using mta.wi-tribe.net.pk as my outgoing mail [sMTP]..

I will be thankful if I find a solution Here..

Regards:

Muhammad Osaid Khan MOK

032-32350750

Osaidism@hotmail.com