How To Setup FastMail Using Your Own Domain with DNSimple

Fastmail logo

I’ve been looking around for email hosting services and found some leads from the HackerNews AskHN site. One of the suggestion is FastMail because of the relatively low pricing, good support and can be setup using your own domain. I’m posting this to share my experience on how to setup Fastmail using your own domain with DNSimple.


FastMail setup is a breeze. Upon sign up you can readily use a fastmail domain hosted email (; also there is 30-Day free trial). At this point you can you can basically check if fastmail meets your needs for email hosting e.g. storage size, device / calendar sync, setup your own domain. For me, I’m more interested on how easy it is to setup FastMail using your own domain with DNSimple.


Since 2014, I’ve used DNSimple for my DNS needs also posted here the steps when I changed my DNS provider to DNSimple. They have a one click service that will add dns records to help you setup dns records with known services like FastMail.


Setting Up

First step is from FastMail get the following mail exchange (MX) record values.


Configure these record values in DNSimple by adding the MX records.


Note: Do the steps above before adding the FastMail One Click Service from DNSImple. I missed these steps the first time so I ended up not completing the setup.

From FastMail, go to Settings -> Domain. Here you can check if proper MX records are set. If yes, you can see a similar message below.


From DNSimple, add the FastMail One Click Service to add DNS records needed by FastMail. You need to input the DKIM value from FastMail to complete the setup from DNSimple.


Fastmail will confirm the setup just like the message below.


Now you are all set with your own domain email hosting. That’s how easy it is to setup FastMail using your own domain with DNSimple.
Keep in touch!

Brew Refusing To Link OpenSSL – .Net Core on Mac


As mentioned in my previous post on exploring .Net CLI, I encountered a problem doing “dotnet restore” on my machine. The problem is brew refusing to link openssl after I updating brew. Here is the old steps as instructed from website.

brew update

brew install openssl

brew link --force openssl

After issuing the command “brew link –force openssl” I encounter this message from brew.

Warning: Refusing to link: openssl
Linking keg-only OpenSSL means you may end up linking against the insecure,
deprecated system version while using the headers from the Homebrew version.
Instead, pass the full include/library paths to your compiler e.g.:
  -I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib

This is the reason why “dotnet restore” is not working with getting the libraries to my machine. I even logged an issue on .Net CLI github to document the error. It seems brew developers blocked the “brew link –force openssl” command to openssl as noted on this brew commit on github.

Since then updated their instructions to the following to fix the issue.

brew update

brew install openssl

ln -s /usr/local/opt/openssl/lib/libcrypto.1.0.0.dylib /usr/local/lib/

ln -s /usr/local/opt/openssl/lib/libssl.1.0.0.dylib /usr/local/lib/

It may be a short term work around as the original logged issue about the error on linking openssl is still open as of today. The good news is that you can now work with .Net Core with .Net CLI on Mac. Lets wait and see. Happy coding!

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