[Dovecot] "try MD5-CRYPT scheme instead"?

I'm getting a lot of entries like this in my log:

Apr 16 10:10:18 postamt dovecot: auth(default): shadow(doxxxris,141.42.206.38): CRYPT(wrongpassword) != '$1$qSe71xxx$09MoMqNyll.wPLCdSaFuA0', try MD5-CRYPT scheme instead

It seems that changing the password via SquirrelMail (poppasswd) breaks the authentication scheme somewhat. Users cannot log in anymore.

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