Decided to summarise my quite verbose email after writing it: 1) What kind of load can Imail cope with, using two postfix helpers 2) What's the accepted/preferred way of exporting domains from Imail to IMGate on a regularly changing config 3) Preferred AV solution
We've just recently switched from Merak (www.icewarp.com - tons of features, poor stability) to Imail. Imail seems fine for the few days we've run it so far, but it's only on a temporary machine at the moment - taking 30-40% load on a 2.8ghz/1gb box. We're putting it on a decent spec box soon to replace this. I've got the IMGate postfix config files from Len Conrad, and investigating putting two Linux (is there any good argument to use FreeBSD over Debian) servers as Imail helpers. The plan is to have one doing virus/spam filtering, and then delivering mail to Imail, the second server would be to process all outgoing email. Either could do both jobs in case of failure. We're expecting this set up to be able to cope with 10,000 domains and 25,000 users, sending up to 50,000 emails daily and receiving 150,000 daily. Is this an unrealistic target? Hope I'm not asking 'how long is a piece of string' My current conundrum is how to populate the transport and relay_domains files. Although IMGate seems to be specifically written for Imail (I understand it's now being used with other products though) there doesn't seem to be an export/import tool for this. Whilst I'm happy to get dirty writing a tool to export the domains/users from the Imail config store (registry in our case) there's no point reinventing the wheel. :) The major consideration with this, is that in our case it really needs to be run every hour. I've seen the Imailusers utility, which obviously exports the domains, but doesn't go the whole hog and get them into a postfix friendly format, from what I can understand. I'm guessing there is a prefferred/standard way of doing this that 99% of Imail users are using - I wouldn't mind knowing what it is. :) Final question has to do with AV filtering, and also spam to point. There are a couple of suitable AV products, my current preferred one through looking at available information is AVG. Also with spam - what filters etc are recommended? What kind of mileage do you get from them? Apologies for all the questions, realise they're very basic but you have to start somewhere. :) Thanks, Ed Butler
