Re: [exim] Sleep during connection

Very well written. But What I want to do is delay only on systems that
have no connected recently. Not trying to delay legitimate mail senders.
I also intend on maintaining a whitelist of the mail systems so that
legitimate mail senders don't get delayed. It'll take a while to build,
but once it is, it'll be worth maintaining.



Thank you,
Greg Borbonus
*Nix Server administrator

On 2/18/2014 7:02 AM, Viktor Dukhovni wrote:
> On Tue, Feb 18, 2014 at 02:38:10AM -0600, Greg wrote:
>
>> Any way to delay a response from exim?
>>
>> Example: when it replies to a user or helo, delay it 2 seconds.
> Unconditionally, or only when the sending system has a poor or
> unknown reputation? Such delays should only be applied at the
> connect banner and perhaps EHLO response to systems that have not
> sent you any email in some time, and only if you use them to detect
> early-talkers for dynamic temporarily black-lists.
>
> Introducing artificial delays into deliveries from legitimate
> sending systems causes congestion (increased latency drives up
> concurrency) on both the sending and receiving system with no
> benefit to either.
>
> Sometimes well-meaning anti-spam measures do as much harm to the
> email eco-system as the spammers, please do not introduce indiscriminate
> delays into email delivery.
>