On Sat, 2023-12-30 at 12:48 -0800, Randolf Richardson, Postmaster via
mailop wrote:
>       If that's what the problem is, then that can easily be set with the 
> following Postfix setting without the need for customization scripts:
> 
>               default_destination_recipient_limit = 1
> 
>       It may also be helpful to adjust the delivery rate, which can also 
> be set in Postfix's "default_destination_rate_delay" setting 


This will work, but you probably don't want to make your entire MTA
inefficient just to appease Google. Those two parameters have per-
transport counterparts,

  * <transport>_destination_concurrency_limit
  * <transport>_destination_rate_delay

where <transport> is the name of your transport. So, for example, you
could create a transport called "slow", and then set

  * slow_destination_concurrency_limit = 1
  * slow_destination_rate_delay = 2s

after which all you have to do is configure postfix to send to gmail
via the "slow" transport instead of the default one. Now gmail is slow,
but nobody else suffers.

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