- do not expose the mailaddr structure to the filter api.
- allow the HELO, MAIL FROM, RCPT TO to be altered by a filter
filter output must be validated in the server, not in the filter glue
Merge branch 'master' of ssh.poolp.org:/git/opensmtpd
do not ommit F_BACKUP otherwise backup MX are broken
Merge branch 'master' of ssh://ssh.poolp.org/git/opensmtpd