Hello,
Mail flow between Exchange 2010 sp3 & Exchange 2013 SP1 not working.
Exchange 2010 when sending mail to external it's ok.
Exchange 2010 when sending mail to exchange 2010 users it's ok.
Exchange 2010 when sending mail to exchange 2013 not working
Exchange 2013 when sending mail to External it's ok.
Exchange 2013 when sending mail to Exchange 2010 or Exchange 2013 not working
From internet --> SMTP GW --> Exchange 2010 it's ok
From Internet --> SMTP GW --> Exchange 2010 --> Exchange 2013 not working.
1 AD site and 1 PDC
With Exchange 2010 exchange 2013 on the same subnet. Exchange 2010 physical machine, Exchange 2013 on Hyper-V ( with same VLAN )
When testing over Exchange 2010 sending mail to exchange 2013 using telnet with commands:
telnet exchange2013.domain.local
mail from: a@b.com
rcpt to: b@b.com
data
test
.
451 4.7.0 Temporary server error. Please try again later. PRX4 (Errors that appear in the telnet screen)
prx2, prx3, or not prx5 just PRX4.
thanks
Bugra Keskin