[CentOS] clustered mail server?
Christopher Chan
christopher at ias.com.hk
Mon May 19 09:17:56 UTC 2008
John R Pierce wrote:
> Christopher Chan wrote:
>> That default setting is no longer applicable today. Users will scream
>> if they find out that their mails have been sitting in the queue for a
>> day. For today's businesses, one day can make or break a deal and so
>> email, being a much faster form of communication than snail mail, has
>> come to be seen as the preferred choice. People start calling when
>> they know they are supposed to get an email in a minute or so when it
>> does materialize.
>
>
>
> So you never send any email to anyone using greylisting? thats odd, as
> its very common nowdays. greylisting servers will auto-reject the
> first attempt at sending an email, then accept it on a later retry
> (typically 10 or 15 minutes is the default retry interval for most mail
> servers). This /guarantees/ email will sit in your outbound queue for
> at least one retry interval.
Yes, so I get to tell the users, sorry, Yahoo is up to its antics again.
Maybe it will go through in an hour. What advantage would I have in
putting the queue on a distributed filesystem if I have to ensure that
the MTAs do not try to both access the queue if they are not sendmail
versus the simplicity of a local mirrored disk setup for the queue?
>
> I frequently run into outbound mail that sits in my queues for several
> hours, the destination servers may be too busy, or they may be offline
> for maintenance, many reasons. There's a k12 school district up in
> Chico CA who's mail server seems to be down as often as its up, and
> there are several folks on that server who subscribe to various email
> lists I host. the mail gets through eventually.
Do you put your outbound mail queue on a distributed filesystem?
>
> Email is /NOT/ IM. If your users expect it to function like Instant
> Messaging, maybe you should suggest they use IM when they want immediate
> response with feedback.
>
I am not going to make an issue of their expectations and make them use
something that is not necessarily available or allowed.
Email + attachments is not quite the same as IM + File Transfers
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