Improvements to attachment plugin
Remove proprietary header
Remove duplicate filename rejection
Fix helo.checks plugin
Merge with upstream
Merge pull request #623 from smfreegard/master

Improvements to attachment plugin
Fix helo.checks again.. add further test
Remove comment
Merge pull request #646 from smfreegard/master

Fix test failures
auth_vpopmaild: mention vuserinfo in sysadmin docs

to point users towards the tool that sets up a user with SYSADMIN privs
Update auth_vpopmaild.md