Forum Discussion
Fegume
Nov 21, 2023Copper Contributor
SmtpResponse: 451 4.4.397 Error comunicating with target host. -> 421 4.2.1 Unable to connect -->
Hello I have: Server Work: Windows Server 2008 R2 Exchange 2010 Server with issue: Windows Server 2016 Exchange 2016 Domain: Windows Server 2016 I try migrate my Exchange 2010 to Ex...
Dan_Snape
Nov 21, 2023Bronze Contributor
Check if your new Exchange server IP address is listed in one of your custom receive connectors.
- FegumeNov 22, 2023Copper Contributor
Hi Dan_Snape ,
Received connector Exchange server 2010 allow all.
The problem is more simple, is on Exchange 2016. I have one mailboxdatabase with one user, mailto:user1@domain.local.
the user1 is configure on my outook. I try send email:
from: mailto:user1@domain.local.
to: mailto:user1@domain.local
The email no received, but I try send to Exchange 2010 users, same problem.
I try Send user on mailboxdatabase on Exchange 2010 to mailto:user1@domain.local and the email yes received.
Regards!
- Dan_SnapeNov 23, 2023Bronze ContributorI'm not sure whether your reply means you have Exchange servers in a custom receive connector or not. You should never put Exchange server infrastructure (ie Exchange server IPs) in a custom receive connector as this may break mail flow similar to what you are experiencing. The default receive connectors are designed to handle internal mail flow between Exchange servers securely and without any requirements for admins to make any changes
- FegumeNov 28, 2023Copper ContributorHello,
The problem is that the same user can't send self a mail.
One question. When user send mail on same mailboxdatabase. It use a send connector or rpc protocol?