Do I have an open relay?

Fernando Gleiser fgleiser at
Thu Jun 19 05:51:33 PDT 2003

On Thu, 19 Jun 2003, Andreas Widerøe Andersen wrote:

> Hi,
> I'm a bit nervous here. Recently I've started getting 20-25 mails to my
> Postmaster account on my FreeBSD 4.8RC server running Sendmail
> 8.12.8/8.12.8 each day with a message to Postmaster that the mail could not
> be delivered.

Sendmail by default does not relay, unless you enable PROMICUOUS_RELAY.
To test if you have an open relay, go to:
and run a test against your server.

It may be a "rumplestinkin attack", the spammers are trying to guess
account names in your server, postmaster gets a copy of the bounce. Look
at the logs for the full info.


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