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Delay in email delivey

I am having email delivery issue, it takes around 5-10 hours to delivery email. sometime it returns this error

" Remote host said: 550 5.7.1 Requested action not taken: message refused  "

it looks this problem is only with domain email
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joyjohn
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joyjohn
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1 Solution
 
Shane32EECommented:
Often that's because DNS-BL lists have blacklisted your IP address.  This might not be your fault, or perhaps your server is connected to a set of IP addresses considered dialup or public (home cable modems, for example).  Try a site like this to see if that's the problem:

http://www.mxtoolbox.com/blacklists.aspx
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joyjohnAuthor Commented:
email are delivering after 5-10 hrs not completly blocked
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Shane32EECommented:
I'd be happy to help you more, but there's not much for me to go on.  If you are receiving a 550 error, that can be diagnosed, but if they are simply delayed, I'd check and see if your server is sending mail directly, or if you're using a "smart" mail server to relay mail from your exchange box.  Look in the SMTP server's properties.
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