issue with multiple exchange server 2016

Hello experts,
I am new to manage exchange and I am facing an issue.
I have 2 exchange 2016 instances running.
At the moment I am migrating all the mailboxes from server one to server 2.
The server 2 is the one that will be the primary and the first one will be decommissioned.
The MX record on the DNS is pointing to the second server.
The DNS also contains a PTR record for the second server ip address to resolve into mail.domain.com.
Some mailbox is on server one and some on server 2 (because I am migrating them)
The server one doesn't have a PTR record on it.
What's happening is that some email is bounced back because the target mail server doesn't find a PTR record for server 1.
I don't understand why as the facing exchange server is the server number 2.
In the DNS there is nothing pointing to server 1.
Why some email are still sent using the server number 1?

Thanks
xtremerealityAsked:
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IvanConnect With a Mentor System EngineerCommented:
Hi,

yeah, scoping will do the trick as well.
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IvanSystem EngineerCommented:
Hi,

you have send connector configured at server1, and that is why some emails are sent via it.
If you don't want that, then simple disable send connector.
Log to EAC --> Mail flow --> Send connector --> click on send connector and on right side, you will find disable.

That will trigger email sent from users on server1, to be actually sent via server2.

Regards,
Ivan.
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xtremerealityAuthor Commented:
Thanks Ivan for your reply.
Is the send connector shared by all servers?
If I disable it, don't you think that server 2 won't send email either?
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xtremerealityAuthor Commented:
I checked the send connector as you suggested. I Think that changing the server in the scoping will to the trick.
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IvanSystem EngineerCommented:
Hi,

send connector is created on organization level, so all servers can share it.
You can have only one, so other server1 will send email via server2.

On server2, go to send connector, and in properties --> scoping --> check if server2 is listed in there.
That way, you are making sure that server2 can still send mail via it's own connector.

What you can also do, is on server2, associate that send connector with server1.

PS: I forgot to ask, but you do have send connector on both servers? Since some email gets bounced back, because it is sent via server1, and some is send via server2, I understand that you have that configured on both servers.
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