Maxprocchars Channel Option

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Specify maximum length header that the MTA will rewrite (maxprocchars)

Processing of long header lines containing lots of addresses can consume significant system resources. (Note, however, that resource consumption is much reduced in PMDF V5.0 as compared with previous versions of PMDF.) The maxprocchars channel option is used to specify the maximum length header that the MTA will process and rewrite. Messages with headers longer than this are still accepted and delivered; the only difference is that the long header lines are not rewritten in any way. A single integer argument is required. The default is to process headers of any length.