Most troublesome domains:
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Domain: wma1880.org
Count: 20
Typical error: 550 Message held as spam. Message will be reviewed by email recipient.
Affected lists: oncourse
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Domain: kaplan.edu
Count: 10
Typical error: 550 5.7.1 Sender ID (PRA) Not Permitted
Affected lists: oncourse
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Domain: hamiltonia.edu
Count: 8
Typical error: 550 5.7.1 Sender ID (PRA) Not Permitted
Affected lists: oncourse
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Domain: txstate.edu
Count: 6
Typical error: 550 5.7.6 Local Policy Violation - PPS
Affected lists: donjuantip
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Domain: tesst.com
Count: 4
Typical error: 550 5.7.1 Sender ID (PRA) Not Permitted
Affected lists: oncourse
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Domain: erau.edu
Count: 4
Typical error: 550 5.7.1 >... Command rejected
Affected lists: oncourse
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Domain: howardcc.edu
Count: 4
Typical error: 550 Denied by policy.
Affected lists: oncourse
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Domain: firn.edu
Count: 3
Typical error: 554 Failure Message looks like spam, sorry not wanted here q=51726166
Affected lists: robin-linda-williams
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Domain: cccofva.org
Count: 3
Typical error: 550 Blocked
Affected lists: the-daily-signal
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Domain: bdonline.com
Count: 3
Typical error: 554 5.7.1 Message cannot be accepted, spam rejection
Affected lists: pjalert