i have this problem and i hope someone can help me fast, because after an update to 5.3.23, i cannot add any domains. vadddomain always crashed with an segmentation fault. i debugged it and the segfaults were caused by two free(in_domain) and another free(..). i commented them out and recompiled, so i could create the necc. domain directories.
Delete the domain, download and install the latest vpopmail (5.3.24) and re-add it before trying anything else.
-- Tom Collins [EMAIL PROTECTED] http://sniffter.com/ - info on the Sniffter hand-held Network Tester