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Bugtraq archives for 1st quarter (Jan-Mar) 1999: Re: SMTP server account probing

Re: SMTP server account probing

Brett Glass (brettLARIAT.ORG)
Tue, 9 Mar 1999 13:51:28 -0700

At 09:36 AM 3/9/99 -0800, John E. Martin wrote:

>While the 'goaway' option may not prevent the program from continuing to
>verify addresses, it will keep your users address from being picked up by
>the program.
>Perhaps someone with better sendmail experience could come up with an idea
>to automatically disconnect connections that are issuing more than 25 VRFY
>statements at a time?

Unfortunately, the program was designed to defeat the "goaway" option by
using RCPT TO: commands instead of VRFY commands. What's needed is
the ability to kill the connection after more than two or three recipient
names have generated errors.