Most troublesome domains:
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Domain: lccc.edu
Count: 57
Typical error: 550 5.7.1 Unable to relay for xxx@lccc.edu
Affected lists: oncourse
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Domain: wma1880.org
Count: 30
Typical error: 550 Message held as spam. Message will be reviewed by email recipient.
Affected lists: oncourse
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Domain: butte.cc.ca.us
Count: 9
Typical error: 550 domain of forward path is not allowed -
Affected lists: oncourse