sendmail

[Marti, Rob]

She's set up as one, and the box is open to the internet (since it relayed mail to gmail).  It may not accept connections from outside the server/local network, but it is still an open relay.

Rob Marti
Systems Administrator
Sam Houston State University
936-294-3804 // rjm002 at shsu.edu


-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On Behalf Of Barry Brimer
Sent: Wednesday, September 03, 2008 9:48 AM
To: General Red Hat Linux discussion list
Subject: RE: sendmail

He telnetted to 127.0.0.1 25 .. which does not make him an open relay.

Quoting "Marti, Rob" <RJM002 at shsu.edu>:

> You're connecting from somewhere other than gmail.com and saying the mail is
> coming from gmail.com.  You're trying to relay mail without authenticating,
> which I would bet google has disabled.  Your MTA A is currently set up as an
> open relay (unless you're at gmail.com).  Read
> http://en.wikipedia.org/wiki/Open_mail_relay to see why this is bad.
>
> Rob Marti
>
> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
> On Behalf Of Joy Methew
> Sent: Wednesday, September 03, 2008 9:11 AM
> To: General Red Hat Linux discussion list
> Subject: sendmail
>
> here is two systems both are "mta" A and B with sendmail.
> A is mine and B is gmail mat.
> when i telnet my mta means A --->>telnet 127.0.0.1 25
> helo hi
> mail from:root at yahoo.com <from%3Aroot at yahoo.com>
> rcpt to:ml4joy at gmail.com <to%3Aml4joy at gmail.com>
> i recived mail very easly.
> it means my mta "A" telnet indirectaly to gmail mta.
> but when i try to telnet directly to gmail mta its give error like.
>
>
> 220 mx.google.com ESMTP t26si1434066ele.4
> helo gmail.com
> 250 mx.google.com at your service
> mail from:ml4joy at gmail.com <from%3Aml4joy at gmail.com>
> 555 5.5.2 Syntax error t26si1434066ele.4
>
> Any idea why the "Syntax error".?
>
> Thanks
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