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The sieve plugin for Thundirbird likes to rapidly compile work in progress sieve scripts to continually give feedback on any errors in the script. This can trigger segmentation faults in lib-sieve with certain pathologically incomplete sieve scripts. One example: #0 tag_comparator_validate (valdtr=0x7f291aa713a0, arg=0x7fff5c3cfa58, cmd=0x7f291aa69360) at sieve-comparators.c:143 143

...ction for verifications like this and that should have been used. Comparator handling predates this function, so I must have forgot to change comparator validation accordingly, which would have fixed this problem implicitly. Well, it is fixed now: http://hg.rename-it.nl/dovecot-2.2-pigeonhole/rev/b6c55ac6460d Thanks! Regards, Stephan.