i cannot send email to hotmail or yahoo from outlook 2007

i cannot send email to hotmail or yahoo account  from outlook 2007 client neither from MS Office Outlook webaccess .

we have our own exchange Server 2007 . we have started facing this problem since 3-4 days before everything was fine.

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seraj786Asked:
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shauncroucherCommented:
Check on mxtoolbox.com --> blacklists that you are not blacklisted.

Shaun
shauncroucherCommented:
If you are, you will need to check that there are no infected Pc's / authenticated or open relay issues

Shaun
Lacretta IncorvaiaCommented:
Good Morning Seraj786,

You may be on a RBL or Spam list?  Go to this site and test to see if your mail server has been blacklisted:  http://mxtoolbox.com/blacklists.aspx.  

LJ

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Alan HardistyCo-OwnerCommented:
seraj786Author Commented:
gt some help
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