Log Message:
Enable greylisting by default via mail/greylisting-spp. To make this a
sensible default, we wrap it in "greylisting-spp-with-exemptions", which
lets recipient addresses and domains be exempted from greylisting by
editing control/greylist/exemptrcpt{s,hosts}.

qmailofmipd: enable user CDB by default and remove the verbiage.

qmailsmtpd: bump datalimit (seeing occasional "fixsmtpio: out of \ 
memory" in production).

Improve MESSAGE a bit more.

Bump version.