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From: Ed Crowley [MVP] on 30 Apr 2010 14:13
Maybe that's because:
- your domain or server is blacklisted
- your ISP is blacklisted
- they're doing a reverse DNS lookup and you don't have valid PTR reverse
lookup record in DNS
- they're using SPF and you don't have a valid SPF record in DNS
- you're using a dynamic IP address
- something else.

Blacklist lookup:
http://www.robtex.com/rbl/
http://www.mxtoolbox.com/blacklists.aspx
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
..

"news" <news_dont_spam_me> wrote in message
news:OVPd9uF6KHA.420(a)TK2MSFTNGP02.phx.gbl...
> Recently i've been getting NDR's saying:
>
> Action: failed
> Status: 5.5.0
> X-Supplementary-Info: < #5.5.0 smtp;552 Unable to process message:
> msg.1272621548.124850.15867 - error: recipient: emailaddress(a)domain.com
> failed, reason: consider the message to be spam>
>
> Anyone have any ideas on what can cause this? My mail servers are not on
> any RBL lists, as far as i can see.
>
>
>
>
>
>

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