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#5.5.0 smtp;550 Command rejected for policy reasons

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#5.5.0 smtp;550 Command rejected for policy reasons - 28.Sep.2006 7:42:31 PM   
adellicott

 

Posts: 1
Joined: 28.Sep.2006
Status: offline
Users are getting the following message from System Administrator when they send mail. I run DNSReport, everything seems OK.  I want to know if and how can I fix it. My domain is 'cadcol.ac.uk'

Thank you

Adrian


This is the message:

Your message did not reach some or all of the intended recipients.
     Subject: 16
     Sent: 28/09/2006 16:14
The following recipient(s) could not be reached:
     xxxxxxxxxxxxxx@hotmail.com on 28/09/2006 16:14
           There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
           <solo.cadcol.ac.uk #5.5.0 smtp;550 Command rejected for policy reasons.>
Post #: 1
RE: #5.5.0 smtp;550 Command rejected for policy reasons - 28.Sep.2006 7:51:00 PM   
GeeZuZz

 

Posts: 101
Joined: 21.May2004
From: Norway
Status: offline
I recieve the same error when sending to hotmail, but I'm fairly sure that is because i've been blacklisted after sending spam.

One of the computers on the network got infected with a virus, and started sending spam, resulting in blacklist at some DNS-blacklists. We noticed the spam issue very fast, and thus managed to unplugg it from internet within an hour - and we are already been removed from the DNS server that blacklisted ut (after 24 hours) - but hotmail still blocks emails from us.

Is it usual to blacklist spammers for more than 24 hours? How long? Are there anything we can do?

It's now almost 48 hours since the last spam message was sent.

Edit:
I checked my IP here: http://www.dnsstuff.com and was listed on 2 of the 270 blacklists. I was able to remove myself from one of them, but the other claims 50EUR for removing me, else i have to wait 7 days.

adellicott: Check if your server is liste at http://www.dnsstuff.com (upper middle)

< Message edited by GeeZuZz -- 28.Sep.2006 8:01:50 PM >

(in reply to adellicott)
Post #: 2

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