I need help, I'm been blacklisted

Chris Barber chris at techquility.net
Sat Jul 10 20:59:33 IST 2010

The error is fairly clear. It says "Proper authentication required".
Since this is an MX mail server, it should not require authentication.
Do you get this error if the sending domain is not your domain? Either
way, you have a misconfiguration in your MTA. 

-----Original Message-----
From: mailscanner-bounces at lists.mailscanner.info
[mailto:mailscanner-bounces at lists.mailscanner.info] On Behalf Of Mark
Sent: Saturday, July 10, 2010 12:37 PM
To: MailScanner discussion
Cc: Juan Pablo Lorier
Subject: Re: I need help, I'm been blacklisted

On 11:59 AM, Juan Pablo Lorier wrote:

> I also checked if we are blacklisted and it seems we are not, but we 
> have 4 servers blocking our mails (all us servers).

How do these servers respond? If they reject you at SMTP, what reason do
they give (from your sendmail logs)? If they accept you at SMTP and then
send a bounce DSN, what does it say?

> I used one web tool I found in google (http://www.checkor.com/) to 
> check if I was relaying and I had this results:
> 220 antispam.montecarlotv.com.uy ESMTP Sendmail 8.13.8/8.13.8; Fri, 9 
> Jul 2010 09:10:35 -0300 HELO ortest.checkor.com
> 250 antispam.montecarlotv.com.uy Hello www.no-ip.com [],

> pleased to meet you RSET
> 250 2.0.0 Reset state
> MAIL FROM: test at checkor.com
> 250 2.1.0 test at checkor.com... Sender ok RCPT TO: test1 at checkor.com
> 550 5.7.1 test1 at checkor.com... Relaying denied. Proper authentication 
> required.
> 250 2.0.0 Reset state
> MAIL FROM: spam at correo.montecarlotv.com.uy
> 250 2.1.0 spam at correo.montecarlotv.com.uy... Sender ok RCPT TO: 
> test1 at correo.montecarlotv.com.uy
> * Test Failed, 250 2.1.5 test1 at correo.montecarlotv.com.uy... Recipient

> ok *

This 'failure' looks bogus to me. Why should you not accept mail for
your own domain? Perhaps they expect an "unknown recipient" response,
but even then they don't know that 'test1' is not a valid local part in
your domain.

Further, even if you were relaying mail that you shouldn't be, this may
get you blacklisted (i.e. added to various blacklists which you say you
have checked and are not on), but if you are not on a blacklist, it
won't get your mail blocked.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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