Thanks for kind reply.. i checked everything in mxtoolbox.com and our domain is has a valid MX. all old users can send or receive emails from external domains only 3 new users has problem.. 

i also found accepted domains option in exchange and yes domain is configured already there and also authoritative domain. 2 domain names are mentioned in accepted domain. 1 is true with .com and other is with .loc with false status. 

Let me know if you any other thing. Thanks.

Hi Usama,

Do you have any transport rule configured for net sending/receiving emails for the specific users. Also, as suggested by Mahmoud.Hanafi, please check if you have set any user level restriction for receiving and sending emails to external domains. 

Hi Usama;

As i mentioned above are you checked if there're any restriction in receiving regarding to those 3 users?

Dear Mahmoud,

Thanks for your reply.

i check new users message delivery restrictions already and found same thing as mentioned in your image. i mean, if new user is trying to send email for example to hotmail or yahoo, they can send it but it is not reaching to hotmail address and no NDR is coming in their inbox. on other hand if i try to send email from yahoo or hotmail to these new email addresses i am getting NDR as i mentioned above in my first message. hope so the point is clear to you now. more than 100 other users are sending and receiving emails from external domains and working fine.. 

for MX Record, how i can send you my domain name in private message? i used test as an example, our domain name is different. 

waiting for your reply. thanks.

Hi Somnath,

No rule has been defined in transport rules section for any user.  i created 1 new test user before 5 minutes in exchange and facing same problem with new user.. it is strange issue that everything is fine except for new users.... and nothing is showing in event viewer as well..

Good, then you can check your exchange system Queue, and give me the last error message.

 

You can send me on this address mahmoud.hanafi@outlook.com

Check that on all your HUB nodes, while you try to send message to external users

Hello Usama;

Would you please check if you have anti-spam that my inspect these users email traffic or not, on the other hand can you please make sure that those 3 users on the same DB with the old users that can sends and receives or not, if not, then try to move them to be on the same old users DB?

Waiting your feed

Hi Mahmoud,

Yes under Organization configuration-- Hub Transport some Anti Spam options are enabled. yes these 3 users are under same DB. i checked this already.  

Hello Usama; Would you please disable the antispam for test, then back it enabled again.

ok let me do that and i will come back to you... Thanks.

Nothing happened... still getting NDR in hotmail ID :(

Dear Usama;

Would you please check with the Microsoft Exchange Troubleshooting Assistant.

After Checking for update go to welcome screen.

Share the result with us.

Hi,

According to the error message, it seems that user does not existing or mailbox is full of the recipient.
Please check the recipient status by ExRCA with "Inbound SMTP E-Mail".

Hi Allen,

Thanks for your reply. i create the user by myself, it is showing in exchange and internal domain email is also working for that user. when i am creating any new user now in exchange server, external domain emails are not working for all new email addresses but for old email addresses everything is smooth and working fine. what do you mean by that mailbox is full of the recipient? i didn't get your point.... 

i checked recipient status in ExRCA and attached is the result for 1 user. when i check my email status and some other old email addresses, everything was successful with this message and green tick for all email addresses "Connectivity Test Successful".

Please do help me if you can trace problem as i am still finding a solution for this problem..

Waiting for your reply. Thanks.

Hello Usama,

Do you have an external spam service that receives and sends messages for your organization?  If not, are there any other email gateway devices that sit between your internal Exchange servers and the internet?

Richard Burrs

Sr. Messaging Engineer

Hi Burrs,

Thanks for your reply.

Yes we have SonicWall Email Security 300 between internet and Exchange server... According to my knowledge we haven't any spam service for our organization... 

Hi Osama;

I found that you're using the following address (ion.softrivahost.com) as a mail gateway, could you please contact with them to know if there're any kind of restrictions on your mail traffic or not, on the other hand if you don't have any relation with this address, then you should to contact with your ISP because they're (ion.softrivahost.com) using the same IP address that you're using with your MX record.

I think this is the problem in your c

Hi Mahmoud,

I will inform you after contacting to softrivahost. i did one thing today that i remove Email Security IP from Send Connectors ---> Network tab and now i am able to send emails from new accounts and also from old accounts but still i can't receive emails in new accounts... You have any idea how i can adjust receive connectors to allow new users at least to start using email without Email Security firewall settings.. Kindly reply me. Thanks.

Hi Osama:

In the following article, the same problem but with old exchange version (2003), regarding to bypass the firewall in receiving, that will impacted your environment by threats, that's the way you can publish your mail system and every message must come through it, but you can disable the mail traffic and DNS inspection on your firewall, on the other hand you can check the firewall logs related with your mail traffic to know what's the rule drooped these messages.

Hi Mahmoud,

Thanks for your reply and support. problem is solved and it was in sonicwall email security. i just overwrite all configuration of firewall and restart it after that everything is smooth now without removing firewall IP from send connectors as well.

• Marked as answer by Usama Aftab 17 minutes ago

Hi Osama;

Thanks God, it's good news i'm very happy to hear that.