Hi, I need to configure, only output, the SMTP smart host to TLS.

EMC, I configured what was possible, but the stakes in what remains. user and pw are correct.

the error is "'451 4.4.0 Primary target IP address responded with:" 451 5.7.3 Require basic authentication. "Attempted failover to alternate host, but That did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts "

yet the utenticazione is configured.

thanks

That message says the two hosts can't talk to each other.  I can't tell you how it's misconfigured because you didn't provide any specifics.

Hello, my configuration to the smarthost is:

FQDN smarthost, flags on Basic Authentication, Basic Authentication over TLS flag, fields filled in a username and password. The stakes, however, remains in the queues

The output port, with this configuration will be the 465?

thanks

Hi,

According to your post, I understand that mail flow failed with error "451 4.4.0 Primary target IP address responded with:" 451 5.7.3 Require basic authentication. "Attempted failover to alternate host, but That did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts" after configure smart host with TLS.
If I misunderstand your concern, please do not hesitate to let me know.

Please run Get-ReceiveConnector | FL to review the configuration of connector, especial permission, authentication.
Please provide more details about your production environment, for example firewall setting, certificate.

Thanks

problem of the service provider smarthostproblem of the service provider smarthost