Exchange 2010 send mail issues

Exchange 2010

Hi All,
My Exchange 2010 server can received mail from others but when I sent out some receipient in another domain cannot get my mail.
I don't see any undelivery message bound back, instead sending from my server to Yahoo or Gmail are fine.

is it any other ways I can do to track this problems?

Many thanks
MAB HamOwn BusinessAsked:
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
Hi MAB Ham,
Please send output of the below command
Get-SendConnector -Identity <SENDCONNECTOR NAME> | fl

Open in new window

Please configure external DNS lookup with your ISP DNS server.
It will look like this.
test.JPGLastly open this site from server and ensure your internal to external NAT is correct. i.e. you should see your Exchange server external IP. 

Make sure SMTP scanning is disabled in firewall.

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Vijaya Babu SekarAssociate Ops ManagerCommented:
You can check the routing through Messaging tracking, event id should be empty. so that you can see the failure and other issues.
Sajid Shaik MSr. System AdminCommented:
are you using any send connector/Smart Host/Email appliance ? or you using ant SPAM filter ?  if you are using Appliance check the DNS settings there ...

check your Domain mx and DNS reverse DNS status on

all the best
IvanSystem EngineerCommented:

is your public ip on some blacklist? check via and report back.

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