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Christopher,

To the people who've been around longer: is this the sort of thing
that should be reported to [email protected] so that they're aware of
the situation with this host?

I don't believe that is necessary, Mark appears to have automatic monitoring for delivery issues:

"INTERNAL: More logging to track email delivery speed"


"FYI: I'm seeing some slow email delivery, and am investigating the

issue."

E.g., is there a per-host configuration that is maintained that would,
say, throttle messages being sent to avoid/limit these soft of
bounces.

Yes:

"... for cox.net and comcast customers because we have to strictly limit
how many messages we send to those services."


Though what Niman reported /is/ different:

421 ... CMGW Connection refused, too many sessions from 66.175.222.12.
Please lower the number of concurrent sessions.

That's distinct from too many messages in a period of time. Each session between Groups.io's outbound server and the receiving service may transfer multiple messages addressed to multiple addresses at that service, coming from multiple groups.

Regardless, the root of these problems are that the email service doesn't have a high enough limit to accommodate messages from a list service like Groups.io, or perhaps boosts the limits for some other legit high-volume sources, but not Groups.io.

It will be up to the affected members to convince their email service to actually deliver desired messages, and not block or throttle them as if they were undesirable.

Shal
Or, my impertinent advice: get a better email service.


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