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realtyserver

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Hi, my company sends out a lot of emails for our customers and we are having an issue with 1 mail server at an ISP we send to that has a limit of emails received per hour from our server IP. A lot of our customers have addresses at this ISP, so we regularily go over the hourly limit which delays messages for up to a few hours (not good for time sensitive emails). I have talked to the ISP and they claim they cannot increase the limit for us or make any special cases.

So my first thought is can we setup a secondary server with Kerio and round robin send emails through both servers? Are there any best practices for this kind of thing? We have plenty of spare servers we could use for this kind of thing, but I'm not sure of what Kerio setup is required. I see it has the option to relay mail to a server, but can it relay through both the main server and a secondary one (and possibly more)? Any help would be appreciated. Thanks,

Kevin
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tonyswu

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I think you either send directly from KC, or use a relay. I don't believe there is an easy way to use both at the same time.

I would try to speak to the ISP again. They may not be able to increase the limit just for you guys, but they can certainly whitelist you. I would also see if you can speak to the customers / clients that are behind that said ISP, and perhaps have them apply the pressure to the ISP.
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freakinvibe

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Do you have a business grade account with your ISP? If so, you should be able to send mail directly, i.e. not through their relay.

If you got a consumer account with them, your IP address might have a port 25 block and you will not be able to send directly, you will have to use their relay.

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

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I should have mentioned these emails are automated, that wasn't clear in the original message. Our mail server sends a ton of mail notifications to our customers and a lot of the recipients are at this one ISP (<_at_>shaw.ca) and they enforce this limit for mail sent from any server like ours (which is not part of the shaw ISP, on the other side of the country, so we have no account with them).

I will try contacting them again, but they seemed pretty confident there was nothing they could do. I'm looking at worst case scenarios here and sending from 2 servers seems pretty reasonable if there was a way to set it up.
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BudDurland

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Does the automated system send out one e-mail per address? Perhaps it can be tweaked to send one mail per domain?

Good is better than evil because it's nicer
--Mammy Yokum
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freakinvibe

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Now that I have re-read your OP I think I have understood. So not your ISP is blocking the mails but the recipient's mail server.

Shaw.ca might have a limit on how many mails might be sent from the same IP address. So do you have multiple public IP addresses available?

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

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There is only 1 recipient per email, but they are all customized emails, so we can't group them if that's what you mean.

We have several servers we could use, so the current plan is to just relay from Kerio to a round robin DNS that points to 2-3 of our other servers. The relays will just be simple Postfix SMTP servers. Not sure if there are other options with Kerio, but that's the best we've come up with so far. That should get around the limits per IP address that shaw is enforcing.
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