Email blocked in Exchange 2010 Queue

irmanes
irmanes used Ask the Experts™
on
Hi,

not anymore able to send emails to only one Domain [synevo.com.ua], the messages stays at exchange queue with error message:

"is invalid or DNS says does not exist"

while sending to any other Domain works.
could you please help?
BR
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Author

Commented:
Hello thanks, nice to meet you
Pete LongTechnical Consultant

Commented:
That domain does not exist  (or cannot be located in DNS)  thats why you are seeing this error?

http://www.petenetlive.com/KB/Article/0000223.php?domain=synevo.com.ua

Author

Commented:
Thanks for Answer, the Domain still exists as people from same location could emails us without problems.
BR
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Try to deliver mail with External MX/DNS lookups and see if it helps

Author

Commented:
I'm not so advanced for DNS changes or configuration, what is strange for me is that delivering emails toward this domain was fluent, few days ago?? I set no changes through DNS changes.
I can request for DNS changes, but need to know what needs to be changed exactly.

Thanks for help.
ok try this :

from the mailserver, download putty
telnet on "mail.synevo.com.ua" on port 25
check if you get connection.

open a command prompt and type :
nslookup -type=mx synevo.com.ua

check if you get a good output.
it could be that for some reason your internal dns does not forward the request for this domain as it should

Author

Commented:

dear,

thanks for help, regarding Putty it gets connected through port 25, below is answer after nslookup.

Non-authoritative answer:
synevo.com.ua   MX preference = 10, mail exchanger = mail.synevo.com.ua
synevo.com.ua   MX preference = 20, mail exchanger = mx1.mirohost.net

mail.synevo.com.ua      internet address = 94.27.12.194
mx1.mirohost.net        internet address = 89.184.64.105
mx1.mirohost.net        internet address = 89.184.64.125
mx1.mirohost.net        AAAA IPv6 address = 2a02:2278:70eb:298::64:125
ok and this in on the exchange server?
then there is no issue with dns lookups.
can you rightclick and select retry on the mailqueue?

Author

Commented:
hi,
yes this happens testing from exchange server, the message status on queue is on retry so no way to get a retry from right clicking. :)

Author

Commented:
this is one of the generated error messages to Outlook :

mx1.mirohost.net gave this error:
"Error 40.4.1: Bad HELO/EHLO or SMTP auth. Please read http://mail.mirohost.net/errors/err_40.html
ok i can't read that ... it's russian or something...

Author

Commented:
looks like to be Russian, as the server is in Ukraine....can't read it too...i wonder if it is not a rejection from anti Spam system, but, this is just a personal feeling??
yeah i tried to deliver a mail using telnet, but can't find a good emailaddress.
you could try (as a check) create a send connector using smarthost just for that domain?
and see if that works
this seemd to be the problem with their server configuration , they are not excepting any HELO/EHLO . I am sure you cant send mail to them from gmail or any other server . there is no point in looking at your server . Ask them to fix their issues if you know them .

Regards
Anup
they do accept helo/ehlo; i just tested it using telnet for OP

Author

Commented:
no way with new send connectors...will test helo/ehlo

Author

Commented:
dears,

through Yahoo, they are not getting the emails too, so certainly something is wrong in the server recipient, I'll bell them to let them know about it. thanks anyway for all, appreciated a lot and also learned things.
Best regards from Belgium.
lol bell them :)
ik dacht al direct dat je belg was toen ik het zag :)
consider awarding points for assistance ;-)

Author

Commented:
Finaly they get the yahoo email, 25 minutes lates i sent it.
ok so it's not solved then?

Author

Commented:
Hi Anyone, I'm still blocked with this issue, I think that the destination rejects our emails because of anti Spam security options:
i set a new sender connector, the sent messages  to this destination [d.petrov@synevo.com.ua] doesn't appear anymore in the exchange server queue but i get anyway a delivery error message:

Delivery has failed to these recipients or groups:

'd.petrov@synevo.com.ua' (d.petrov@synevo.com.ua) <mailto:d.petrov@synevo.com.ua>
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
The following organization rejected your message: mail.celox.lu.

really appreciate any help.
best regards
yeah this is definately being blocked at their site.
Can you contact them and have em check why?

Author

Commented:
heloo again

they don't sunderstand good English, so, you can imagine the mater...but all in all, i think, I'm quiet sure that my new exchange mail server is not yet set with a new Reverse DNS, that's why, they do reject our server such a sender location, this is what i think, now, for solutions, i called them asking to permit our external address, will see if they understood it. i wrote to ISP asking for a Reverse DNS setting UP.
i think that this should be fine. maybe if you could advise about exchange server internal Reverse DNS set up ways.

what do you think?

BR
normally your old Rdns will still be valid, if the domain and IP is the same as before
you do not need internal Rdns , as this is pointless :)

The only test i can recommend, is to make a send connector ONLY for that domain, and have it deliver over smarthost (relay.skynet/smtp.telenet or whatever) and test if they receive it that way, if they do then you can safely assume the problem is at your end or with anti-spam or whatever.

Author

Commented:
hi, no the old Rdns is not the same as I'm still using my old exchange server [not all the users are yet migrated to new domain], what i did, i created a send connector to this destination, that uses the internal IP address of old exchange server, therefor the emails toward this destination are not in the queue anymore, but we get always a delivery failure.
if i should use relay.skynet.be, what IP address should i specify to rout the email for this send connector?
you could just make it easy and modify the existing send connector for a second to relay.skynet and all the mails will continue flowing normally

Author

Commented:
perfect, using skynet relay works perfect. but for better way of use isn't it better to set a Rdns?
thanks for help.
yes it is,
but to clarify:

you only have 1 public IP , and there was an old server, which is still there , but replaced by a new exchange which uses the same domain/Public IP
cause, if so the Rdns would not need to be modified.

Also please note that when using relay.skynet, Out of office replies will not work. I know this for a fact

Author

Commented:
No, we do have 2 exchange servers with 2 different external addresses. there reason to keep the old one is that, there are still users [mailboxes] and network resources not migrated to the new one.
ok if that is the case, then you do need to have a new >Rdns to the other IP for the new server :)
I suspect everything will be solved then

Author

Commented:
Hi

Correct, i did a request to the ISP...hopefully, it works already with skynet.
if you do not mind, i have a small question, this is not something urgent, but, just a project for near future:

what it is the best format to export Exchange 2003 GALs and Import them to Exchange 2010?

best regards from Belgium.
irmanes
you do not need to export them...
normally if you move the mailboxes, and there is a route relation between the 2 hosts (2003 - 2010)
they GAL get's transferred by itself.

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