COMCAST
http://www.comcastsupport.com/Forms/NET/blockedprovider.asp
YAHOO
http://help.yahoo.com/l/us/yahoo/mail/postmaster/unblock.html
HOTMAIL
check
exim -bt If you receive "mx1.hotmail.com" like intication try: telnet mx1.hotmail.com 25 If this does not work IP is blocked in hotmail You need to add SPF record for specific domain if you face any issues with hotmail Go to WHM and add SPF record.
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