SMTP Block by Country
Question asked by Philip Lippard - May 11 at 3:37 AM
Answered
Is there a means to block SMTP usage by a country ? 

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John Marx Replied
I want to extend this to webmail login only. Our clients are 100% inside the United States. It would be great (at the domain level) to allow blocks like this. If a domain choose to allow awesome. Most those will want to block logins from outside the United States.
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Kyle Kerst Replied
Employee Post
One way you might be able to achieve this is via CloudFlare. Cloudflare DNS allows you to route HTTP/HTTPS requests through their servers, at which point you can apply firewall/application specific rules to the traffic. In this case you'd just need a page rule that drops traffic to your webmail interface originating outside of the USA. You can also add foreign IP address ranges under Settings>Security>Blacklist to ensure the same locations cannot access the IMAP, SMTP, POP ports, etc. 
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com
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Kyle Kerst Replied
Employee Post Marked As Answer
SMTP usgae can also be restricted by blacklisting foreign CIDR blocks, but this can be a problematic approach as users don't always come in from expected IP addresses.
Kyle Kerst
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com

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