Most troublesome domains:
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Domain: mailvault.com
Count: 24
Typical error: 550 relay not permitted
Affected lists: 861 offshore-manual-newsletter ptbuzz
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Domain: buffnet.net
Count: 12
Typical error: 500 Mail appears to be unsolicited -- send error reports to steveh@buffnet.net - if you attached an executable file or a ZIP file - rename it and tell the person you are sending it to to rename it back to the original when they save it.
Affected lists: heartwarmers petwarmers
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Domain: myway.com
Count: 12
Typical error: 550 5.7.1 UrLSpam
Affected lists: naomiragen