On Wed, Jul 22, 2020 at 08:58:49AM +0530, deepaksharma559--- via Exim-users 
wrote:
> Is it possible to force a time delay. For example my email account user @
> domain.com is sending 3-4 emails to the same receipient in 1 second. Is
> there a setting in exim to insert a delay by ex: 10 seconds.

 AFAIK exim has no built-in tools for that, but you can use some external
 serializer in transport for outgoing mails:

  transport_filter = /path/to/delay-script $sender_address $pipe_addresses

 This script should check some time stamp from previous ivocation
 (in database or in file, etc) and sleep necessary time before return.
 With proper locks and (if need ) granularity on sender/recipients.

 Note that such delay causes an exim instance to wait, consuming memory,
 so it opens additional vector for DoS attack.
 
> Actually I want to insert a delay between each message that goes out any
> remote destination.

 Apply common timer for all sender/recipients.
-- 
 Eugene Berdnikov

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