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On Sun, Apr 5, 2020 at 05:43 PM, Niman H wrote:

Their email delivery history shows many responses of

": 550 5.1.0 <66.175.222.12> This IP has sent too many messages this hour. IB504 <>"

66.175.222.12 is the IP address of Groups.io's outbound mail server.

Some Mail Service Providers suddenly take it upon themselves to bounce Groups.io mail for reasons nobody really knows; getting an MSP to admit to this is likely to be tricky. One blind spot is that any group owner can only see bounces for their own group; there is no means of knowing (without asking the individuals concerned) how many groups they subscribe to and how many emails they receive as a result. "Too many messages" is a somewhat unclear description of the problem; how many is too many!

Check your members' mail providers (the Bouncing list is a good place to start) to see if there is anything that might be statistically significant.

Chris

On 2020-04-05 at 9:24:24 AM, Niman H <nimanh2000@...> wrote:

I checked my bouncing members list today and found several there, all with
the same message as the response: "mailstore1.secureserver.net: 421
p3plibsmtp01-05.prod.phx3.secureserver.net CMGW Connection refused, too
many sessions from 66.175.222.12. Please lower the number of concurrent
sessions. IB007 <> "
<SNIP>

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? 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.

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Christopher W. <lists@...>

On Mon, Apr 6, 2020 at 02:47 AM, Christopher W. wrote:

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?

No, the members should report it to their mail service provider.? The 4xx isn't serious and GIO will try resending the message.? The 5xx is a hard bounce, so GIO won't send it again.

Duane
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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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Sally,

Seems strange that they all have the exact same message and IP
address.

The IP address 66.175.222.12 is Groups.io's outbound server. So not strange at all.

Is anyone else getting this message for bounced members?

Those, and messages like them, seem to plague users of certain email services. The services don't seem to understand that Groups.io is a list service, and try to limit the delivery of messages as if the messages were undesirable. Or maybe they have inadequate server resources to handle users who subscribe to mailing lists.

Shal


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