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No timing gaps exist in the design, which could cause a mail loss.
It is normally positioned at or near a central mailer, not necessarily where users' mailboxes and final delivery takes place.
amavisd-new is a high-performance interface between mailer (MTA) and content checkers: virus scanners, and/or Spam Assassin.
It is written in Perl for maintainability, without paying a significant price for speed.
See the Free BSD-SA- security advisory which applies to a file(1) utility distributed with the operating system.
It is always a good idea to use fairly recent versions of external programs and external Perl modules.
amavisd-new provides rfc2821-compliant SMTP server and client, a rfc2033-compliant LMTP server and client, and generates rfc3462/rfc3464-compliant (ex rfc1892/rfc1894) delivery (and non-delivery) status notifications.
This makes it suitable for mail anti-virus and/or anti-spam checking on a busy mail gateways that care for reliability and standards compliance.
When calling of Mail:: Spam Assassin (SA) is enabled, it calls SA only once per message regardless of the number of recipients, and tries very hard to correctly honour per-recipient preferences, such as pass/reject, check/nocheck, spam levels, and inserting spam-related mail header fields.
amavisd-new benefits from the use of Perl module Net:: Server, which offers a fast pre-forked multichild process control.