Re: [exim] Mail with thousands recipients takes exponential …

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Author: Bill Cole
Date:  
To: Olaf Hopp (SCC) via Exim-users
Subject: Re: [exim] Mail with thousands recipients takes exponential longer time
On 11 Mar 2021, at 15:59, Olaf Hopp (SCC) via Exim-users wrote:

> Dear collegues,
>
> my administration writes one(!) email with more than 3000 receipients
> in the envelope. (Please, no discussion about the sense of this.
> Period.)
>
> Receiving that mail takes about 2 two hours.
> Delivering that mail is done very quick, as usual.
>
> I started debugging this and I recognized that
> after every "RCPT TO" it took a sucessive increasing time
> until the "250 Accepted" was answered.
> At the beginning this was a 10th of a second.
> After 1000 recipients there was a delay of ~one second
> after the 2000th recipients this delay increased smoothly
> to 2 secends ofter each rcpt-to
>
> I threw away all my bells and whistles in the exim config,
> but no success.

[...]
> Any ideas what's happening here ?


Check your config for ACL lines setting "ratelimit" and/or "delay". See
examples at
https://www.exim.org/exim-html-current/doc/html/spec_html/ch-access_control_lists.html

--
Bill Cole
bill@??? or billcole@???
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire