Just tried to enter the eBid monthly competition via the newsletter and entry kicked back with the following:
==========================
This is the mail system at host omr-m010e.mx.aol.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<competitions@ebid.net>: host mx.ebid.net.cust.a.hostedemail.com[216.40.42.4]
refused to talk to me: 554 5.7.1 Service unavailable; Client host
[204.29.186.10] blocked using urbl.hostedemail.com;
https://www.senderscore.org/blacklistlookup/
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Just thought I'd let you know.