I've now found the trigger! It is completely unrelated to dovecot-imapd. What made mutt crash all the time, was the contents of LD_PRELOAD. I had /usr/lib/libaoss.so (package alsa-oss) preloaded all the time in order to enable OSS dependent apps to use ALSA dmix. Unsetting LD_PRELOAD fixed it.
Please try out and see if you can reproduce (install alsa-oss and run "aoss mutt"). Thanks, Johannes
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