Potential remote code execution in zend-mail via Sendmail adapter

More info at https://framework.zend.com/security/advisory/ZF2016-04...

CVE-1999-1554

/usr/sbin/Mail on SGI IRIX 3.3 and 3.3.1 does not properly set the group ID to the group ID of the user who started Mail, which allows local users to read the mail of other users...