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Q0052
Nigel Metheringham edited this page Nov 30, 2012
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What does ridiculously long message header in an error report mean?
There has to be some limit to the length of a message's header lines, because otherwise a malefactor could open an SMTP channel to your host, start a message, and then just send characters continuously until your host runs out of memory. (Exim stores all the header lines in main memory while processing a message). For this reason a limit is imposed on the total amount of memory that can be used for header lines. The default is 1MB, but this can be changed by setting <small>HEADER_MAXSIZE</small> in Local/Makefile before building Exim. Exceeding the limit provokes the ridiculous > error message.
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