While theere may be minor bugs not yet found, I believe 1.0.8 is battle tested and feature complete for release as the first non-beta version.
I have rewritten msmtpq and msmtp-queue as msmtq-ng and msmtpq-ng-queue. The concept is the same but method has greatly changed, syslogging is added, an stdin/stdout SMTP server has been added, and queue management is completely different (more comptible with sendmail/postfix).