There are a bunch domains that are incredibly sensitive to this kind of
thing. Crank up the concurrent connections and search logs for
"*connections*" You'll find the ones that care really quickly. There are
plenty of them.

On Fri, Sep 6, 2019 at 3:29 PM Blake Hudson via mailop <mailop@mailop.org>
wrote:

> For what it's worth, Oath is the only email service provider I've ever had
> to rate limit outgoing email to. All other email service providers seem to
> work fine when one uses the (seemingly sensible) Postfix defaults.
>
> Laura Atkins via mailop wrote on 9/6/2019 2:49 PM:
>
> Gmail has never suggested they care.
>
> Laura
>
> Sent from my iPhone
>
> On Sep 6, 2019, at 8:38 PM, Brandon Long <bl...@google.com> wrote:
>
> Now people have made me curious what they set those values to for Gmail.
> We don't have simple limits like those (a quick check shows the max number
> of messages sent on a single connection in the past week is 414k, and I
> know I've seen total number of connections from a single source over 10k),
> the throttling is on a more esoteric collections of signals ...
>
> Brandon
>
>
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