| NOTES |
- DKIM_CBSTAT_CONTINUE should be returned by the callback
on normal successful completion, indicating to library that normal
operation should proceed
- DKIM_CBSTAT_REJECT should be returned by the callback if
the callback is able to determine that the message should be rejected;
this will cause the library function which used the callback to
return DKIM_STAT_CBREJECT
- DKIM_CBSTAT_TRYAGAIN should be returned by the callback if
the callback is unable to process the message at this time but a later
attempt might succeed; this causes the library function which used
the callback to return DKIM_STAT_CBTRYAGAIN, and the caller can
re-attempt that call later
- DKIM_CBSTAT_NOTFOUND should be returned by the callback if
the record being sought was not found
- DKIM_CBSTAT_ERROR should be returned by the callback if
the attempt to retrieve the requested record returned in some kind
of error
- DKIM_CBSTAT_DEFAULT should be returned by the callback if it does
not wish to return a result and instead wants the library to proceed
as if the callback were not configured
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