email from server going to yahoo / hotmail junk spam folder

I have just had a website built and installed in my hostgator linux dedicated server account. The script was done in php and my sql. The problem is when a registered user sends email invite to friends yahoo or hotmail account it goes to junk / spam folder. My programmers are still trying to resolve the problem, need some one whos dealt with similar problem to speed up process.

Kemahiran: Linux

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Tentang Majikan:
( 10 ulasan ) London, United Kingdom

ID Projek: #321193