Thanks d00p, sure good enough for me! do.
I would like to force strong passwords upon the mail users (mail accounts being created with froxlor, in this case v.0.9.39.5 , on Debian Stretch). What's the best way to go about it? ... cracklib ... ? Recommendations or experiences, anybody? I looked for "password strength" and "cracklib" here, but to no avail. Thanks all! do.