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peter@pln.co.uk

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I'm using Kerio as a backup mail server (MX3) storing email into user mail boxes when the primary MX is unavailable.

An example helps to show what I want to do -

A user with local email address abc<_a.t_>123.co.uk wants to send an email to 456<_a.t_>123.co.uk

I want Kerio to force the email to use DNS (e.g. go to MX2) and not to realise the recipient is on a local email domain.

In my configuration MX2 is acting as a gateway for storing and forwarding mail back to MX1 when it becomes available.
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freakinvibe

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If you use KMS as a backup, users wouldn't access it for sending mail, would they? The backup solution would only be used for receiving mail and passing it on if the primary server is available again. You can make that work by using the ETRN functionality, see

http://kerio.co.uk/manual/kms/en/sect-example5.html

If this is not clear, let me know.

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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peter@pln.co.uk

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We're it so simple.
The store and forward you describe is implemented but I have a client who is worried about his mail server crashing say over a weekend and potentially being off-line for 3-4 days.
In this case I need to give them access to individual pop mailboxes whilst we repair etc.
It's difficult to describe my problem but here goes.
When the primary mail server has been fixed some users will continue to use the backup system which will result in users now on the primary server not getting these emails.
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sgongola

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Your downtime solution is to use POP. I don't see where it says what client use (or webmail) and whether you use pop/smtp, imap, mapi when the main server is up.

I think I understand what you are trying to do. Your users have to know when a machine is down and how to switch servers. I believe the kind of solution you are looking for is beyond kerio. Possibly exchange can handle it with redundant boxes and failover. Otherwise, If email access is this critical, the only right solution is to to have someone available/on call to fix the problem during weekends to maintain email availability.

Rather then switching outgoing email boxes, you can use your ISP provided outgoing box and it should use your MX records to route the email to the secondary if the primary box is down.

[Updated on: Wed, 11 March 2009 19:11]

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peter@pln.co.uk

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The solution is to use a mailserver that can act as a gateway for the store/forward part (MX2) which can also forward mail to another host.
I use MDaemon for this but MDaemon doesn't allow a postmaster/catchall on each email domain (it has one global postmaster/catchall). Whereas, using aliases Kerio can support a postmaster/catchall per email domain. This allows the solution to be used for a number of our clients.
I envisage that users would use webmail which creates the problem I am trying to solve. But you're right, if I use Outlook and have 2 email accounts set up in a single profile and collect from both I have a workround.
Thanks for your input.
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