The transport server returns the letter?

Question

SMTP

Good evening!
A problem has arisen! There is Excahnge 2013 (DAG, 2 MBX, 2CAS, 2EDGE). All this is domain mail.
I struggled with a problem for a couple of days, the mail hung in the queue and was not sent to the mailboxes, I overcame the problem ... But another one got out, when sending mail out, the letter immediately returns back, tell me where to dig, because there is no strength with this Exchange yet

Another moment, if restart transport on EDGE then mail goes out

Answer 1

You need to check the settings of all connectors on the Edge Server.
How is the interaction between the Exchange organization and Edge Server configured - through Edge Subscription or not?
Check out these articles for answers:
Edge Subscriptions in Exchange Server
Configure internet mail flow through Edge Transpor...

Answer 2

Search google for "your" error "smtp unable to relay". First answer :(

Answer 3

In general, the problem was solved quite simply, in the send connector, in addition to EdgeSync, I registered my Exchange_to_Internet connector. Screenshot of settings below. Maybe someone needs it)