exchange 2010

I am trying to send email from my outlook 2010 to following domain:
below error
Delivery is delayed to these recipients or groups:

xxx@xxxxx.com

Subject: test

This message hasn't been delivered yet. Delivery will continue to be attempted.Delivery is delayed to these recipients or groups:

xxx@xxxxx.com

Subject: test

This message hasn't been delivered yet. Delivery will continue to be attempted.

Delivery is delayed to these recipients or groups:

xxx@xxxxx.com

Subject: test

This message hasn't been delivered yet. Delivery will continue to be attempted.
The original message was received at Thu, 30 Jul 2015 14:34:32 -0500 from m0077983.ppops.net [127.0.0.1]

   ----- The following addresses had permanent fatal errors ----- <toms@madpark.com>

   ----- Transcript of session follows -----
451 4.4.1 reply: read error from ex.madpark.com.
<xxx@xxxxx.com>... Deferred: Input/output error Message could not be delivered for 5 days Message will be deleted from queue

our email goes through proofpoint gateway which has tls enabled
pramod1Asked:
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Miguel Angel Perez MuñozCommented:
Could you search on transport logs about this connection? This will give up more information (host unreachable, drop connection)

Thanks.
0
pramod1Author Commented:
where should I check transport logs in exchange 2010
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pramod1Author Commented:
451 4.4.1 reply: read error from ex.madpark.com.
 <xxx@xxxxx.com>... Deferred: Input/output error Message could not be delivered for 5 days Message will be deleted from queue- what does this mean
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pramod1Author Commented:
map_lookup(access, Try_TLS:ex.madpark.com) => NOT FOUND (0)
rewrite: ruleset D                  input: < madpark . com > < ? > < ! "Try_TLS" > < >
map_lookup(access, Try_TLS:madpark.com) => NOT FOUND (0)
map_lookup(access, Try_TLS:207.173.178.165) => NOT FOUND (0)
map_lookup(access, Try_TLS:207) => NOT FOUND (0)
rewrite: ruleset A                  input: < 207 . 173 . 178 . 165 > < ? > < ! "TLS_Srv" > < >
map_lookup(access, TLS_Srv:207.173.178.165) => NOT FOUND (0)
map_lookup(access, TLS_Srv:207) => NOT FOUND (0)
map_lookup(access, TLS_Srv:) => NOT FOUND (0)

I am getting above undeliverable message, what does this mean
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pramod1Author Commented:
what is tls_srv not found on host we are sending email
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
As i see on mxtoolbox i couldnt find a MX entry for this, if you could share the SMTP domain or just search on the mxtoolbox site if its not available emails wont be delivered, if they are blacklisted by some RBL then too it will have issues

- Rancy
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pramod1Author Commented:
the domain is madpark.com , I am sending email to tom@madpark.com

they have their mx record , if you  can double check , I am getting TLS_Srv:207.173.178.165 error

when sending email to that domain
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is this really Exchange or is it Lotus/Sendmail ?

Do you have a SendConnector for this domain ? If so was it recently modified or some changes done ?

- Rancy
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