[CentOS-docs] amavisd-new, spamassassin and clamav

Michael Crider wrote:

> 1. amavisd-new may occasionally lose a message, while MailScanner (from 
> my own experience) never allows a mail to be deleted from the incoming 
> queue until it is in the delivery queue.

FWIW, Amavisd-new makes similar claims:

"does not lose or corrupt mail when unpredictable things happen, 
including I/O errors, disk full conditions (to the extent of underlying 
Perl/file-system/OS ability to detect errors), or a machine crash; the 
responsibility for mail always stays with MTA"