Re: Cannot send to Gmail Resolved
- From: <ChongJa@xxxxxxxxxxxxxxxx>
- To: <exchangelist@xxxxxxxxxxxxx>
- Date: Mon, 6 Mar 2006 16:58:10 -0500
Looks like my hunch was correct. When I telnetting into GMAIL's server this
time, I got
421-4.7.0 Our system has detected an unusual amount of unsolicited
421-4.7.0 mail originating from your IP address. To protect our
421-4.7.0 users from spam, mail sent from your IP address has been
421-4.7.0 temporarily blocked. Please visit
421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review
421 4.7.0 our Bulk Email Senders Guidelines. 15si118050wrl
This is really odd this is the first time I recevied a new message that means
something. Even now, if I were to telnet I don't get this message but rather
the
421 4.7.0 Try again later, closing connection. 27si7409145wrl
Connection to host lost.
I must've hit them at some particular time. We are not sending any SPAM, I
think it's us sending them a bunch of NDRs and they're system is thinking we're
sending them bulk email. I did notice in my SMTP logs that some domains that
think NDR messages (messages with <> in the from field) thinks its SPAM and
will close the session. Hopefully once we get this LDAP filtering in place we
can circumvent this.
________________________________
From: Chong, James
Sent: Monday, March 06, 2006 3:57 PM
To: [ExchangeList]
Subject: [exchangelist] Re: Cannot send to Gmail (revisited)
http://www.MSExchange.org/
Thanks for the input. It's a pain in the A** to get anything changed in here
and will not get approved. They would want to find the solution rather than a
band aid. We are in the process of replacing our all our gateway mx servers
with updated SPAM solutions since ours is older than dirt, so I'm hoping this
issue will go away when this happens. Another thing I noticed is that these two
boxes take different routes out to gmail when I tracert, I'm wondering if this
has something to do with it as well since logs also indicate transient network
failure when talking to gmail.
________________________________
From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx]
Sent: Monday, March 06, 2006 2:08 PM
To: [ExchangeList]
Subject: [exchangelist] Re: Cannot send to Gmail (revisited)
http://www.MSExchange.org/
Know what? I'd create a connector, putting the gmail smtp domain as the address
space, and make Exchange deliver the message to the Gmail MX that is accepting
connections from your server.
And for that MX that sends out a lot of NDR's, make it deliver messages for
gmail thru your other MX, that should take care of it. Create a connector on
the failing MX pointing to your other MX as the smart host that'll make the
delivery for all gmail.com address space.
Tiago de Aviz
SoftSell - Curitiba
(41) 3340-2363
www.softsell.com.br
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pelo conteúdo ou a veracidade desta informação.
>>> ChongJa@xxxxxxxxxxxxxxxx 6/3/2006 15:40 >>>
http://www.MSExchange.org/
I'm still experiencing intermittent connectivity issues with one of my outbound
mx servers to gmail. Mails to gmail get delayed. When telneting to gmails mx
server I get 421: 4.7.0 Try again later, closing connection.
f15si3983265qba".
This only happens to gmail, I do not have any issues with mail flow to other
domains when this happens, only to gmail and it only happens on one of my mx
servers. When this happens I can connect to gmails mx servers fine from my
other mx server. I have contacted gmail to look into this, which they said they
are looking into but have not received an answer. This is what I think is
occuring. The mx server we are having an issue with, is a dedicated outbound
mail server and sends out a larger volume of mail compared to our other
outbound mx server. This server sends out a ton of NDRs. (We don't do ldap
filtering yet) I think we may be sending a large volume of ndrs to gmail and
they are blocking this particular server. Keep in mind that the connection is
intermitent and mail flow from this server will resume sometimes hourly plus or
minus. I think gmail has some security parameter in place that thinks we're
sending them spam or doing some sort of DHA attack. Does anybody have any
insight on this or some sort of policy that gmail may have? Here's a thread,
looks like couple other people have experienced this but no answers posted.
Thanks.
http://groups.google.com/group/Gmail-POP-and-Forwarding/browse_thread/thread/128ce204a9ac4d5d/ce1e8617aa303897?lnk=st&q=421+4.7.0+gmail&rnum=4&hl=en#ce1e8617aa303897
<http://groups.google.com/group/Gmail-POP-and-Forwarding/browse_thread/thread/128ce204a9ac4d5d/ce1e8617aa303897?lnk=st&q=421+4.7.0+gmail&rnum=4&hl=en#ce1e8617aa303897>
James Chong
ETS Sr. Exchange Engineer
Office: 703.206.7548
Cell: 703.863.1483
chongja@xxxxxxxxxxxxxxxx
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