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Configuring message size limits

Issue:

Some programs that feed messages to SpamAssassin, such as spamc, have a maximum-size limit. Messages larger than this limit will not be processed and will be delivered without spam filtering.

Solution:

For spamc, the default message size limit is 500KB. You can raise the maximum-size limit of spamc using a command-line option or a spamc configuration file (see the spamc manpage).

Other programs truncate a large message to some smaller size before sending it to SpamAssassin. If you use such a program in combination with spamc, then it should be configured to truncate at less than spamc's maximum-size limit so that spamc will process it.

The Authority Plug-In for SpamAssassin accepts very large messages but currently only processes the first 300KB. Since the average spam message is much smaller than 300KB, this limit does not significantly affect accuracy.

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