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Remote Server returned '550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain'
Hi there,
Having an issue with the receive connector in our hybrid Exchange 2016 environment. Successfully ran through the HCW and have migrated a test mailbox. I can send/receive internally to that mailbox and email from an external address to it also. What I can't do is email from the test mailbox to external addresses. That results in the Remote Server returned '550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain' message.
I have read various articles and it looks like the Default Frontend receive connector is set correctly but my on-prem environment isn't using it. There is already a custom receive connector listening on port 25 for SMTP relaying for network devices. I'm sure this is what the issue is but not sure how to move forward as they requirement for that connector is there.
Thanks,
Simon
Having an issue with the receive connector in our hybrid Exchange 2016 environment. Successfully ran through the HCW and have migrated a test mailbox. I can send/receive internally to that mailbox and email from an external address to it also. What I can't do is email from the test mailbox to external addresses. That results in the Remote Server returned '550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain' message.
I have read various articles and it looks like the Default Frontend receive connector is set correctly but my on-prem environment isn't using it. There is already a custom receive connector listening on port 25 for SMTP relaying for network devices. I'm sure this is what the issue is but not sure how to move forward as they requirement for that connector is there.
Thanks,
Simon
ExchangeMicrosoft 365* Exchange HybridNetworking
Last Comment
smcauley
Hi, this link should help : https://docs.microsoft.com/en-us/exchange/mail-flow/connectors/allow-anonymous-relay?view=exchserver-2019#step-1-create-a-dedicated-receive-connector-for-anonymous-relay
If you successfuly ran HCW.
Did you reconfigure outlook of test mailbox?
Did you reconfigure outlook of test mailbox?
ASKER
Hi Louis,
I already have an dedicated receive connector setup for anonymous access which is locked down to IP addresses for the purpose of email relay of printers etc. I think that's what O365 is trying to use which is the issue.
I already have an dedicated receive connector setup for anonymous access which is locked down to IP addresses for the purpose of email relay of printers etc. I think that's what O365 is trying to use which is the issue.
ASKER
Hi Mas,
I've been testing using OWA so don't think that is the issue.
I've been testing using OWA so don't think that is the issue.
Did you sort out your issue ?
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