Are you using authdaemond? I expect you'll have two sets of 5 daemons running, one set for sqwebmail and one for courier-imap. If so, it may be worth restarting the sqwebmail authdaemond and see if that helps.
Yes, I use Authdaemond. There are two sets of 6 daemons running. Stop & Start Sqwebmail resolve the problem partially. After 3 Stop|Start procedures the result
Known bug in the vpopmail module. Try the vpopmail mailing list.
If vpopmail people do not fix this bug, I'll simply pull the vpopmail module out. I don't want to deal with their bugs any more.
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