A client of ours has recently had trouble sending emails to a few clients of theirs, the IT department of one of their clients sent this error message that they received:
Quarantine log entry is shown below:
"03/18/14 14:07:22","IP DNS Blocklist","xxx[at]capecodfishermen.org<mailto:xxx[at]capecodfishermen.org>","xxx[at]archipelago.ca<mailto:xxx[at]archipelago.ca>","RE: xxx","Quarantined","Sending mail server found on bl.spamcop.net","<617EB773D2C5694781BF4AD79E28197AC68E4EF9FE[at]SERVER.ccchfa.local<mailto:617EB773D2C5694781BF4AD79E28197AC68E4EF9FE[at]SERVER.ccchfa.local>>"
I've already searched to see if the IP address of their company is only any black list via mxtoolbox and spamcop, no results have been detected.
Please advise, it looks as thought he mail server itself is getting blocked by its name or something.