GWVSMTP

This is GWVSMTP.

Level 1

The SMTP interface allows incoming and, or, outgoing mail to be intercepted, scanned, and filtered completely independent of the mail system. This setup has the distinct advantage of relieving the mail system of unnecessary and unwanted traffic, leaving the mail system resources open to function with greater performance and security.

The SMTP interface adds a scanning layer between any mail system’s SMTP agent and the internet. Outbound mail is forwarded through the GWAVA SMTP, (like a proxy), which can scan the mail and then send messages to the internet. Incoming mail is first received by the SMTP interface which then sends the filtered mail to the SMTP agent. This interface allows GWAVA to act independently of your mail system.

Level 2

The gwvsmtp process listens on SMTP port 25 and transfers SMTP connections to the gwava process for scanning.

GWAVA control commands rcgwavaman stop gwvsmtp rcgwavaman start gwvsmtp

Check if gwvsmtp is listening on port 25

1. lsof -i tcp:25

COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME gwvsmtp 9495 root 41u IPv4 1100393 0t0 TCP *:smtp (LISTEN)

Testing SMTP using TELNET telnet mail.foo.com 25

Relayed Mail Scenario

   Step 1  --  Source Host to Relay Host
  
      S: 220 foo.com Simple Mail Transfer Service Ready
      C: EHLO bar.com
      S: 250-foo.com greets bar.com
      S: 250-8BITMIME
      S: 250-SIZE
      S: 250-DSN
      S: 250 HELP
      C: MAIL FROM:<JQP@bar.com>
      S: 250 OK
      C: RCPT TO:<@foo.com:Jones@XYZ.COM>
      S: 250 OK
      C: DATA
      S: 354 Start mail input; end with <CRLF>.<CRLF>
      C: Date: Thu, 21 May 1998 05:33:29 -0700
      C: From: John Q. Public <JQP@bar.com>
      C: Subject:  The Next Meeting of the Board
      C: To: Jones@xyz.com
      C:
      C: Bill:
      C: The next meeting of the board of directors will be
      C: on Tuesday.
      C:                         John.
      C: .
      S: 250 OK
      C: QUIT
      S: 221 foo.com Service closing transmission channel

RFC2821 Simple Mail Transfer Protocol http://www.rfc-editor.org/rfc/rfc2821.txt

Hands On

GWAVA Stats are processed by the GWVSTATS Module.