Recently a lot of people who email me at my TCH hosted domain are getting bounced emails. I do business though my site, and this is very bad for me. I had spam assassin turned on, which is now off, but the errors being reported seem more like bounced messages, rather than a product of a spam filter.
Here is an example message that one of my contacts received when emailing me (email edited for security, just in case):
Sorry, we were unable to deliver your message to the following address.
Remote host said: 550 in an RBL, see Blocked - see http://www.spamcop.n...?18.104.22.168" [RCPT_TO]
--- Below this line is a copy of the message.
My experience with networking is not enough to make heads or tails of that. I really need reliable email. Any help is appreciated!