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"Duplicate Message Checksum" error
"Duplicate Partial Message Checksum" error
These are errors that might be received after sending out a "duplicate"
e-mail. Course mail tries to avoid mail loops by keeping a record of the
messages that pass through it (a checksum of the message characters) and
rejecting any subsequent messages from the same person with the same
checksum. This would occur if you post the same message twice, either
accidentally or on purpose.
However, it does not check attachments, so if someone at one point sends a
message consisting of ONLY an attachment (no message text), or an attachment
with a standard bit of introductory text, then any subsequent attempts to
send different attachments in the same way will be rejected because they
appear to be identical messages from the same person.
This problem can be solved by changing the message body of the e-mail,
for example by adding or removing a few words.
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