To answer your question, yes it is possible and anything is possible.....

cPanel provides geoip blocking and we use it on our hosted servers.

Your question should be, will ST consider including it.

IMO, it should be available - security first, convenience second 

I would love this, and it makes me a sad panda that SmarterMail doesn't have such baked-in. 

Granted, we do have a large number of customers who travel overseas, but there are some regions where blocking wholesale would be far worth the few tech support tickets from customers who are on vacation in Aruba or hiking through the Andes, or on a mission in India, and just want to check their email. Honestly, between the Netherlands, Brazil, Turkey, Poland, Egypt, and Thailand, if we could geo-block just these we'd get rid of 98% of our Brute-Force traffic. We have been manually using the Blacklist in Smartermail to block an entire subnet after the third IP in an ASIN is blocked by Smartermail's IDS for Brute-Force, but it is tedious, time-consumming, and like swatting flies.

I suppose SmarterTools probably believes that this is a network layer issue rather than something to be solved at the application layer and that if a SmarterMail Admin were really serious about geo-ip blocking they'd just use Firewall Rules to block this traffic instead...and for the most part they aren't entirely wrong for thinking that. However, with the rising predominance of cloud services having the luxury of doing such things at the network layer is becoming increasingly rare and there should be a way to do this at the application layer within SmarterMail itself.

I like this idea, +1 from me. We'll see what happens. If you want I can turn this into a feature request for tracking.

That would be great to change it. Thanks.

+1 here too. 

This would be the most awesome feature ever :) and why I wish SM had some awesome hook points to do stuff like this for those of us with programming skills. We did something similar to identify what country a sending mail server is from to allow some of our customers to block email coming from specific countries.

+1 here too

Adding a bump to this request as I think its something that would benefit all mail administrators.

Jade, in the meantime, you can add a whitelist entry covering the CIDR range for the country you want to allow in, then add blacklist entries for CIDR ranges covering the countries you want to block. SmarterMail will check the whitelist before checking the blacklist, so you should still be able to receive incoming email from desired countries while blocking access from the others. I know this isn't an ideal solution and can be pretty tedious, but should help clear up those brute-force attempts you're seeing originating in Russia. 

Hey Kyle,

I did similar to what you suggested but ran out of time...

It would take literally a few hours just to block connections from Russia...

Geoip blocking is built to handle this without messing around with ASN'