No, in our case with the same error, we needed to exclude the Narrowcast SMTP process (mcsmtpsv.exe) from being blocked by the firewall.
In our case that was the McAfee firewall.
This is specific to McAfee, but other firewalls will have similar rules.
For McAfee, it is the "Prevent mass...
Hi
We had a similar issue and it turned out to me the McAfee firewall blocking NCS with the “Prevent mass mailing worms from sending mail” rule in the Access Protection Properties
It is possible to Excluded Processes from this.
If this is the issue, you need to exclude the mcsmtpsv.exe...
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