The protocol that governs the addressing of email on the Internet uses information in your DNS: these are the MX records.
They are ranked in order of importance, the record with the lowest value is usually your mail server, higher values are your ISP's mail relays.
Relays are used to temporarily receive your messages, if your server does not respond.
We will use this property and set the priority of receiving messages to the Email Filtering Service to the lowest value.
After processing your messages, the Email Filtering Service will send them back to your mail server.
Normally this is simply done by the person who manages your DNS (which will most often be your Internet Service Provider, ISP).
The request for modification must be made to him.
You will find an example of a request in the annex, which you can print on your letterhead before sending it to him.
It will normally take several hours for the change to propagate across the Internet, but you will start to get your first secure messages as soon as the change is made.
Here is an example that illustrates this. The extract from the DNS table shows the MX fields of the domain "your-name-domain.com":
mailgate.your-name-domain.com is the mail server for the domain (value 5), smtp.isp.net and secours.isp.net are relays (equal value of 40).
This table means that if the message cannot, for whatever reason, be delivered to mailgate.yourname-domain.com, it is instead routed to either of the two relays which have a preference value of 40.
These hosts will periodically attempt to forward the email message to a host with a lower preference value, the mailgate.your-name-domain.com mail server.
In our case, in order to process the messages before the mailgate.yourdomainname.com server receives them, we set the Email Filtering Service servers as follows:
Edit your MX records!
|
MX server address |
Priority |
|
france.security-mail.net |
50 |
|
europe.security-mail.net |
10 |
In detailed edition:
@ 10800 IN MX 10 europe.security-mail.net.
@ 10800 IN MX 50 france.security-mail.net.