Reverse DNS does not match SMTP Banner

[Steve]

Hi,

I have installed Sendmail on Centos 5.3
Recently, I made a test with
http://mxtoolbox.com

Apparently that seems to be OK, except that I have :
Warning - Reverse DNS does not match SMTP Banner

I tried to modify the sendmail file with :
dnl SmtpGreetingMessage=mail.xxxx.com

but apparently, nothing 's changed

- Should I modify something else ?

Thanks

[MxToolBox Support]

Steve,

Thank you for using our SMTP Diagnostics tool (http://
www.mxtoolbox.com/diagnostic.aspx)! The short answer is that the
reverse IP address name is not contained in the server HELO or EHLO
banner. This is only a warning, and in some cases you may have no
control over this. However, if you have the ability to make these
match, you should. Some mail servers look for this and use it to mark
messages you send as questionable. Most mail systems will not reject
your messages outright, but this may effect your spam score increasing
the likelihood your messages will be marked as spam.

In other words, it is a best-practice you should endeavor to follow.
It doesn’t mean you are a bad person or won’t be able to send email.

Let us know if we can help with anything else.

Thank you,
MxToolBox

On Nov 13, 1:56 am, Steve <St...@noreply.fr> wrote:
> Hi,
>
> I have installed Sendmail on Centos 5.3

> Recently, I made a test withhttp://mxtoolbox.com

[Steve]

Hi MxtoolBox

thanks for your reply.
I would like effectively, decrease the risk to be considered as a Spam
If i an improve the "SPAM SCORE " that would be great !

However, my problem is that I don't know how to change my configuration
into Sendmail.

- Any idea how to change it ?

Thanks

[Snuff]

> > On Nov 13, 1:56 am, Steve <St...@noreply.fr> wrote:
> >
> >> I tried to modify the sendmail file with  :
> >>         dnl SmtpGreetingMessage=mail.xxxx.com
>
> >> but apparently, nothing 's  changed
>
> >> - Should I modify something else ?
>
> >> Thanks

Try adding to your sendmail.mc:
LOCAL_NET_CONFIG
Djmail.xxxxx.com

[Andrzej Adam Filip]

The following would be cleaner:
#v+
define(`confDOMAIN_NAME',`mail.xxxxx.com')
#v-

URL(s):
http://www.sendmail.org/m4/whoami.html

--
[pl>en Andrew] Andrzej Adam Filip : an...@onet.eu : Andrze...@gmail.com
While your friend holds you affectionately by both your hands you are
safe, for you can watch both of his.
-- Ambrose Bierce, "The Devil's Dictionary"

[terryc]

On Mon, 16 Nov 2009 20:59:13 +0100, Andrzej Adam Filip wrote:

>> Try adding to your sendmail.mc:
>> LOCAL_NET_CONFIG
>> Djmail.xxxxx.com
>
> The following would be cleaner:
> #v+
> define(`confDOMAIN_NAME',`mail.xxxxx.com')
> #v-

Just to clarify, you are specifying Mailhost + Domain and not just
domain?.

[Andrzej Adam Filip]

YES - it defines $j("this host email name")

Comments in cf/m4/proto.m4 (so also in sendmail.cf) are "somehow
misleading" but doc/op/op.me ("INSTALLATION AND OPERATION GUIDE")
describes meaning of $j properly:

<quote src="cf/m4/proto.m4">
# my official domain name
# ... `define' this only if sendmail cannot automatically determine your domain
ifdef(`confDOMAIN_NAME', `Dj`'confDOMAIN_NAME', `#Dj$w.Foo.COM')
</quote>

http://www.sendmail.org/~ca/email/doc8.12/op-sh-5.html#sh-5.2
<quote>
$j The "official" domain name for this site. This is fully qualified if
the full qualification can be found. It must be redefined to be the
fully qualified domain name if your system is not configured so that
information can find it automatically
</quote>

--
[pl>en Andrew] Andrzej Adam Filip : an...@onet.eu : Andrze...@gmail.com

Television is now so desperately hungry for material that it is scraping
the top of the barrel.
-- Gore Vidal