On 12/23/19 2:08 PM, Alessandro Vesely wrote:
Anyway, real SMTP clients use DNS. I'd consider IIoT devices as submission
Color me skeptical. From an idealist perspective I would like such
devices to submit mail to MSAs using port 587, or better, TLS over port
465. I'm just not sure that will fly as there seems to be a lot of
mindshare in that world around submitting mail using port 25. More
generally, there's a lot of preference for using as little configuration
as possible, especially per-device configuration.
But I'd probably support recommendations for IIoT clients to use 587 or
465 with authentication, especially if TLS could be profiled in such a
way as to permit the authenticated party to be the client end rather
than the server end.
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