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apollo-13

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unable to send E-mails to specific domains with Exchange Server 2007.

I am unable to send E-mails to specific domains with Exchange Server 2007.I have not all my customers the same Problem.
 
Example i try to send one of my customer(name@customer.com) a mail but they cant receive my mail.

Where can be problem?
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Manpreet SIngh Khatra
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apollo-13

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Rancy Please more Help.
How can i be sure wehere is a problem?
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@ gaurav2rawat
"If its happening with some and not happening with some, then it can't be an issue with your exchange transport, you could try doing telnet on port number 25, and also nslookup to verify name resolution for their mx  registered host. "

Do you mean with "their" that the adress which mail i cant send? not my exchange server?

Thanks
@Rancy
here i need my domain name ?
Hope they arent blacklisted www.mxtoolbox.com.

what do i need to see here?
@Rancy
Check Mailflow www.exrca.com (Inbound and Outbound)
Inbound says sucessfull.

Outbound? must be their mx IP address isnt?
under Exchange 2007 tools -Troubleshooting assistant shows up email :received

is that mean that I SEND CORRECT AND RECEPEINT RECEIVED?
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if my mails goes to like spam the other side, what do i need to check? i am not sure but only idea ,maybe spam like goes.
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@Rancy
i use ISP is smarthost address.I have no DNS records for Smart host.  if mails go to spam ordner in the other side .is that mean my ISP must be changing do? or My MX something i can do ?
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I have exchange server 2007 and i configured smarthost address hub transport and port 25 is open.I have no problem receiving and sending mails.But I have a specific mails problem.My mails when i send then go to like spam ,i do not understand where is the problem?
why essipecilly when i send this user mail address then my mails not received.

I send a day 500 mails with other mail adresess no problem,only that address no accept my mails.

???
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