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Re: set maximal_queue_lifetime for incoming and outgoing different ?

From: Jorey Bump (listjoreybump.com)
Date: Wed Aug 01 2007 - 07:35:44 CDT

Listaccount wrote:
> Zitat von Alexander GrĂ¼ner <agruenergmx.de>:
>
>> Hi,
>>
>> my postfix just relays mails to a Lotus Notes server and the internet.
>>
>> Internet <-> Postfix <-> Lotus Notes
>>
>> My maximal_queue_lifetime is set to 2h which works fine. This
>> relatively small amount is because the users want to know very fast if
>> the mail is not deliverable. Earlier they sent an offer and received 5
>> days later, that it does not work...
>
> RFC 2821 (section 4.5.4.1) state that you should at least use 4-5 days
> to retry. If you set your value that low you go for trouble with
> slow/overloaded hosts, long greylisting or network outages. Use the
> delay_warning_time instead of breaking e-mail delivery.
> E-Mail is not a real time communication and should not be used as such.

I second that. The 5 day default provides email administrators with a
valuable safety net. Like any safety net, you hope that you will never
need it, but it had better work when you do. I've relied on it more than
once.