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roly

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hello
by sending over our smtp-relay (our internet provider) we are blocked from some mailservers, because the provider is on a blacklist. not still, but..

so we changed to send dirctly over dns. that works fine.
but we do not want to send over dns!

is there a way (like in ms-exchange) to create some connectors with different rules?
for example:

if the recipient is "user<_a.t_>example.com" then sending over "smtpX.provider1.net" else send over "smtpY.provider1.net" or something like that.. ?

we want to have the choice, what smtp-relay we use.

any ideas ? Cool

thank a lot and bye from switzerland Razz , roly
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phil_w

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No, you cannot do that with Kerio.

Why don't you want to send via DNS?
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roly

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hello phil

sending directly over dns is a little bit dangerous... Shocked
we prefer sending over a smarthost or isp-relay.

thanks and bye from ch Smile , roly
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phil_w

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Hi Roly

I prefer DNS - feel more in control of everything - no waiting if ISP has outgoing mail delays...
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freakinvibe

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Hi Roly

Why do you consider sending over DNS as dangerous?

Dexion AG - The Blackberry Specialists in Switzerland
https://dexionag.ch
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hbianchi

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The possibility of creating smtp routing would permit to separate traffic, to setup different routes and/or delays to some routes, etc.etc (e.g. many users retransmit their mails to gmail or hotmail with filter rules. If this traffice could be routed thru a different smtp and/or have differential priority or delay, it would be great. Same for having more than one relay possibility, at least an alternate smtp if first one is not available.
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j.a.duke

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roly wrote on Thu, 09 July 2009 11:55

hello
by sending over our smtp-relay (our internet provider) we are blocked from some mailservers, because the provider is on a blacklist. not still, but..

so we changed to send dirctly over dns. that works fine.
but we do not want to send over dns!

is there a way (like in ms-exchange) to create some connectors with different rules?
for example:

if the recipient is "user<_a.t_>example.com" then sending over "smtpX.provider1.net" else send over "smtpY.provider1.net" or something like that.. ?

we want to have the choice, what smtp-relay we use.

any ideas ? Cool

thank a lot and bye from switzerland Razz , roly


You can setup routing on a domain by domain basis.

Simply create a domain on your server (like aol.com or verizon.net) with no users.

Check off in the Forwarding tab "If recipient was not found in this domain, forward the message to another host" and enter the SMTP relay server and port number.

Repeat as needed for each domain.

If your SMTP relay server requires authentication, this won't work, directly. What I've done to work around this is to setup a copy of Postfix running on my server that accepts connections only from the local machine on a non-standard port and Postfix is set to authenticate to my ISPs relay server. I use this only for one domain, sending the rest of my mail via DNS records.

Handing off my to an ISP passes whatever limitations of their servers on to your users. Most ISPs here limit outgoing email message sizes, so using their relay server will generate errors, creating more work for the mail admin.

Also, by handing off the message, you don't know if it has been successfully delivered to the recipient and when that delivery happened. By sending direct, I have a full log of the transactions between the servers and see clearly when those happened and can report that a message was delivered, or not.

Cheers,
Jon
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roly

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hello jon

thank you. sounds very intresting.
the main problem is fixed. the isp, we have a fiberglass-internet, has fixed all smtp-problems (blacklists.. ).
we now send again over the isp.

but i'd like to test your proposal. ;o)

so thank you all and have a nice time !

bye from ch and Smile

[Updated on: Wed, 15 July 2009 18:16]

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Nixs

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We have been using j.a.duke's solution for a long time now for domains with unique requirements. Works well for us.
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