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Bad SMTP prompt at host

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Jim Steil

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Feb 22, 2008, 11:03:00 AM2/22/08
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Hi:

I'm getting the following bounced back to me whenever I try to send
email to a domain on a 1and1.com account. Can anyone help me figure out
what is causing it. 1and1 support says that we are not on any
blacklists or anything, but is unable to give me any clues as to why my
email bounces back.

This is a warning message only.
Your message remains in the server queue,
the server will try to send it again.
You should not try to resend your message now.


Message delivery to 'aaa...@bbbbb.com' delayed SMTP module(domain
bbbbb.com) reports:
mx01.1and1.com: Bad SMTP prompt at the host

Does anyone have any clues or ideas?

Thanks!

-Jim


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Lyle Giese

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Feb 22, 2008, 11:10:31 AM2/22/08
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>From your server telnet to port 25 on their server and see what you get
back.

Lyle

Jim Steil

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Feb 22, 2008, 11:17:03 AM2/22/08
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Thanks for that.  I get the following:

550 RBL rejection: local dynamic IP address 999.999.999.999
Connection closed by foreign host.

So, it appears that they are rejecting me for being on a blacklist, but when I checked with their support, they said our address wasn't on any blacklists.  So, I assume I should continue to pursue with them.  Thanks for the nudge in the right direction.

    -Jim

Duane Hill

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Feb 22, 2008, 11:19:22 AM2/22/08
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On Fri, 22 Feb 2008 10:03:00 -0600
Jim Steil <j...@qlf.com> wrote:

> Hi:
>
> I'm getting the following bounced back to me whenever I try to send
> email to a domain on a 1and1.com account. Can anyone help me figure
> out what is causing it. 1and1 support says that we are not on any
> blacklists or anything, but is unable to give me any clues as to why
> my email bounces back.
>
> This is a warning message only.
> Your message remains in the server queue,
> the server will try to send it again.
> You should not try to resend your message now.
>
> Message delivery to 'aaa...@bbbbb.com' delayed SMTP module(domain
> bbbbb.com) reports:
> mx01.1and1.com: Bad SMTP prompt at the host
>
> Does anyone have any clues or ideas?

Do you get their SMTP 220 banner if you telnet to their server on port
25 from your CGP box?

They are all responding from here:

[d.hill@admin ~]$ telnet mx01.1and1.com 25
Trying 74.208.5.4...
Connected to mx01.1and1.com.
Escape character is '^]'.
220 mx01.perfora.net (mxus4) Welcome to Nemesis ESMTP server

-------
_|_
(_| |

Duane Hill

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Feb 22, 2008, 11:25:46 AM2/22/08
to
On Fri, 22 Feb 2008 10:17:03 -0600
Jim Steil <j...@qlf.com> wrote:

> Lyle Giese wrote:
> > >From your server telnet to port 25 on their server and see what
> > >you get
> > back.
> >
> > Lyle
> >
> > Jim Steil wrote:
> >
> >> Hi:
> >>
> >> I'm getting the following bounced back to me whenever I try to send
> >> email to a domain on a 1and1.com account. Can anyone help me
> >> figure out what is causing it. 1and1 support says that we are not
> >> on any blacklists or anything, but is unable to give me any clues
> >> as to why my email bounces back.
> >>
> >> This is a warning message only.
> >> Your message remains in the server queue,
> >> the server will try to send it again.
> >> You should not try to resend your message now.
> >>
> >>
> >> Message delivery to 'aaa...@bbbbb.com' delayed SMTP module(domain
> >> bbbbb.com) reports:
> >> mx01.1and1.com: Bad SMTP prompt at the host
> >>
> >> Does anyone have any clues or ideas?
> >>
> >> Thanks!
> >>
> >> -Jim
>

> 550 RBL rejection: local dynamic IP address 999.999.999.999
> Connection closed by foreign host.
>
> So, it appears that they are rejecting me for being on a blacklist,
> but when I checked with their support, they said our address wasn't
> on any blacklists. So, I assume I should continue to pursue with
> them. Thanks for the nudge in the right direction.
>
> -Jim

It appears they are rejecting you because they think your IP address is
dynamic and not static.

-------
_|_
(_| |

Communigate Forum

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Feb 22, 2008, 11:32:06 AM2/22/08
to
hi,

we used have this or something very similar sending mail to verizon who
are our isp, their smtp would close off the connection because of some
very odd reverse dns test they did on incoming connections. i think it
related to the name of the actual server (netbios name) being the same
as the external dns related name, both had to be mail for instance..

they must have changed something as we can now send them mail..

what does your log say about the connection, i bet it says they dropped
your connection..

rup

Jim Steil

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Feb 22, 2008, 12:12:48 PM2/22/08
to
No, here is all that I get.....


telnet mx01.1and1.com 25
Trying 74.208.5.4...
Connected to mx01.1and1.com (74.208.5.4)
Excape character is '^]'.
550 RBL rejection: local dynamic IP address 99.999.999.99

Connection closed by foreign host.

    -Jim

Duane Hill

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Feb 22, 2008, 12:39:59 PM2/22/08
to
On Fri, 22 Feb 2008 11:12:48 -0600
Jim Steil <j...@qlf.com> wrote:

> No, here is all that I get.....
>
> telnet mx01.1and1.com 25
> Trying 74.208.5.4...
> Connected to mx01.1and1.com (74.208.5.4)
> Excape character is '^]'.
> 550 RBL rejection: local dynamic IP address 99.999.999.99
> Connection closed by foreign host.

I just tried a telnet from my cable Internet connection at home and it
was blocked based on my cable Internet IP being found on sorbs.net:

550 RBL rejection: Dynamic IP Addresses See: http://www.sorbs.net/lookup.shtml?12.202.96.238

If you didn't get a URL or additional comments, I would guess they also
are implementing other means to figure out if an IP is dynamic or not.

What does your IP address resolve to? Does it have any wording that
would signify the IP is dynamic in nature?

Jim Steil

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Feb 22, 2008, 1:15:31 PM2/22/08
to
I have checked a number of these lists and cannot find our IP an any of them, including SORBS.  I've used the www.mxtoolbox.com tools to check, and get nothing other than OK in the status.  I finally got them to change the server mentioned, so that I can now login to it (mx01.1and1.com), but now mail is also going to mx00.1and1.com and that is still getting the 550 rejection error.  So, sorry for the off-topic post, but you've definitely helped me get to the bottom of the problem.

    -Jim

Stefan Seiz

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Feb 22, 2008, 1:28:42 PM2/22/08
to
On 22.02.2008 19:15 Uhr, Jim Steil <j...@qlf.com> wrote:

> I have checked a number of these lists and cannot find our IP an any of them,

> including SORBS. I've used the www.mxtoolbox.com <http://www.mxtoolbox.com>


> tools to check, and get nothing other than OK in the status. I finally got
> them to change the server mentioned, so that I can now login to it
> (mx01.1and1.com), but now mail is also going to mx00.1and1.com and that is
> still getting the 550 rejection error. So, sorry for the off-topic post, but
> you've definitely helped me get to the bottom of the problem.

Whatever it is Jim, there's one thing you know best: Are you on a Dynamic IP
or not? If so, you should possibly not operate a mailserver on a dynamic IP
directly, but have your mailserver relay outgoing email through your ISP.

There are many reasons to block mailservers operating on a dynamic ip.

If you are indeed on a static IP, then 1&1's configuration is simply broken
and they need to figure it out.

--
Stefan Seiz <http://www.stefanseiz.com>
Spamto: <b...@imd.net>

Jim Steil

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Feb 22, 2008, 2:02:47 PM2/22/08
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Definitely, positively on a static IP address.

    -Jim

Jim Steil

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Feb 22, 2008, 4:42:25 PM2/22/08
to
I think I may finally have closure on this one.  First off, 1and1 finally figured out just what you were telling me, that they consider my IP address to be dynamic and not static.  They sent a request to change the status of the address (not sure how they do that...)  But, I then contacted my ISP from whom we received our IP addresses.  It turns out that they do not have a reverse dns entry for that IP address which could be the reason that it is considered to dynamic.  This was troubling to me, because I have asked them to add it at least 2 times over the past year.  So, hopefully I should be able to send mail to these users again once the reverse dns entry propagates throughout.

Thanks to all for the help.  1and1 never would have figured out the problem if I hadn't told them what I learned here on the list.

    -Jim
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