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Home » Kerio User Forums » Kerio Connect » Multiple SMTP relay servers (fall back) (How can we configure multiple SMTP servers for multiple gateways)
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gabrielk

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Hi,

We've recently purchased and configured a Draytek Vigor with Dual WAN. All works fine, including the load balancing and one connection failing won't be noticed anymore... Except for the email.

In the Kerio server we have only 1 SMTP relay server which we cannot access via both internet connections, but per connection. So if the connection which belongs to the smtp relay server fails, we can't sent mail anymore.

Any suggestions how to solve this (mx delivery isn't an option) in Kerio or maybe some freeware smtp server which has the option of delivering kind of load balancing/fail-over to multiple smpt servers would be greatly appericiated.

Thanks,
Gab
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anthony.somerset

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you can send by mx records - see attached image

[img]index.php?t=getfile&id=1465&private=0[/img]

just select deliver via MX records

if your router is using failover then surely the connection if dropped should retry and be able to connect over the other connection?

we are using smtp relay until we migrate mx records and also have all users in system

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Mac Xserve Intel - 2x 2.7GHz Dual Core Xeon
Leopard 10.5.8
4GB Ram
1.25 TB HDD Raid 5
Kerio 6.7.1
~60 Users (varying windows and mac Exchange or IMAP)
18 iPhones
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gabrielk

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What do you mean by migrating MX records?

You add your own IP address in the DNS and start using it?
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anthony.somerset

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gabrielk wrote on Thu, 25 September 2008 08:02

What do you mean by migrating MX records?

You add your own IP address in the DNS and start using it?



we are currently using pop downloads to get our messages and send through smtp relay, because not all users use KMS yet. when all our users are on kerio from our external host, we will then add the mx records for our server. its working fine this way but there is the 2 minute delay for recieving mail from non kerio users due to the pop download.

for DNS its not quite as simple as that. the MX record that tells everyone where your mailserver is, has to be a fully qualified domain eg mail.example.com. notice the trailing period that signifies that mail.example.com is fully qualified (ie its not on a furher subdomain of that level)

then obviously for the MX record, you need to create an A record which gives the domain address you just provided an IP address

Mac Xserve Intel - 2x 2.7GHz Dual Core Xeon
Leopard 10.5.8
4GB Ram
1.25 TB HDD Raid 5
Kerio 6.7.1
~60 Users (varying windows and mac Exchange or IMAP)
18 iPhones
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