Tag Archives: DNS

Secondary MX

I run my own home mailserver for two reasons, because I enjoy setting up systems and because I can. However, having just 1 mailserver introduces some problems. While according to the RFCs, sending servers are to keep sending failed mail for some time, they often dont. Consequently, if my server goes offline, loss of internet, reboot etc, I often loose a lot of email.

The solution to this is to have a Secondary MX (Mail Exchanger). This is another email server that will also accept email for your domain and keep trying to forward it to your Primary MX, forever. So, when my server comes back up, the email gets sent and not lost.

For a while, i’ve been using DNS Made Easy for my Secondary DNS and MX (don’t forget a secondary DNS, otherwise they can’t find out about your Secondary MX if your Primary DNS is down!). It worked, but not very well and recently i’ve noticed that i’ve been loosing email. DNS Made Easy have no information about their service status either, you have to trust that it’s working.

So, after searching for a while, I came across RollerNet. They provide many serivces, Primary/Secondary DNS/MX etc. I got a free account with them and was amazed at their quality of service. Most importantly, they give detailed logs of your MX status, such as mail received, mail in queue and the option to force-initiate a transfer of mail to your Primary MX. On top of that, they have all the usual spam filtering using the major blacklists, so no false-positives. Unfortunately, their free account has a limit of 50 messages a day (and many spammers target the Secondary MXes) so i’m now exceeding my message limit. No harm done though, i’m really impressed by their quality of service and going to take out a proper subscription. Good job RollerNet!