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IPv6 Certification Walkthrough – Administrator-level, Hurricane Electric (part 4)


Part four of my IPv6 certification walkthrough for Hurricane Electric: Become an IPv6 Sage!

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IPv6: Administrator Level Certification

Need help on a different IPv6 certification level?  I have walkthroughs for all of them!  These walkthroughs are for OS X.

  1. Newbie
  2. Explorer
  3. Enthusiast
  4. Administrator
  5. Professional
  6. Guru
  7. Sage
  8. Beyond Sage

Conceptual Overview of Earning the Administrator-Level Certification

Your task at this level is to set up a functioning email server, create an MX DNS record, and then ask Hurricane Electric to send you an email--all over IPv6.

  1. Set up a basic SMTP server on your Mac
  2. Create an MX record on
  3. Ask HE to email you at your IPv6 mail server
  4. Check your mail and enter the code on the HE site

Step-by-step Instructions

Edit the Postfix Config File

Luckily, OS X is essentially a server operation system, but by default the server-like features are disabled.  We have already enabled the Web server and now it is time to turn on the mail server.  To do this, you will need to adjust some settings in a config file and then turn the service on with a Terminal command.

  1. Open /etc/postfix/  in a text editor
  2. Make the following changes:
#myhostname = host.domain.tld
#myhostname = virtual.domain.tld
myhostname =

#mydomain = domain.tld
mydomain =

mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,

inet_protocols = ipv6
inet_interfaces = all

 Start Postfix (Your New Mail Server) from Terminal

sudo postfix start

Test that you Can Connect to Port 25 from Terminal

telnet localhost 25

If you see output saying …connected to host … you should be good to go.  Then exit out.


As an alternative, you can also try typing

netstat -an | grep LISTEN | grep ".25"

to verify functionally.  If you get a result withLISTENING , it should be working.

Forward SMTP Traffic to your Computer

Your mail server is working now, but no one will be able to reach it over IPv6 until you make it available to the Internet.  This is done via port forwarding, just like when the Web server was set up, except this time, it needs to be a different port number.

  1. Log into your router
  2. Search for a setting called Port Forwarding or Virtual Server
  3. Enter your private IPv4 address
  4. Enter or choose port 25 (smtp traffic)
    • Some routers will have common services in a list, which will populate the fields for you.  See the options on my router below:jacobsalmela_ipv6_admin_port_forward
  5. Choose TCP if there is an option for it
  6. Click Save or Enable

Create An MX Record So HE Can Find Your New Mail Server

Now that your server is up and running, we need to tell HE how to find it.  This is done by creating an MX DNS record.

  1. Navigate to
  2. Click the button next to your domain to edit the DNS records
  3. Click New MX
  4. Enter your domain informationjacobsalmela_ipv6_admin_mxrecord

There should now be a AAAA and an MX record in the zonejacobsalmela_ipv6_admin_dnszone

Ask HE to Email You At Your New IPv6 Server

DNS can sometimes take a little time to replicate across the Internet, so if it doesn’t work right away, just wait a little bit before trying again.

  1. Navigate to
  2. Enter your (find your username by typingwhoami  in the Terminal)
  3. Click Send it!

Check Your Email To Find the Verification Code


There should be a line reading:

 N     1           Sun Nov  3 09:41  26/893   "IPv6 Certification Administrator Mail Test"

Type 1  and press Enter to read the mail.  Copy the code from the body of the email to your clipboard.

Paste the Verification Code Into the Field on HE’s Site to Verify That You Are Running the Server They Just Sent An Email To

  1. Navigate back to
  2. Paste the code into the field and click Submitjacobsalmela_ipv6_admin_enter_email_code
  3. Answer the test questions to complete the level and earn the certification

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