How to configure your domain server in order to make your MX trusted sender

If you want to prevent servers that receive your mail to mark your email has a spam, you have to tell them that your MX server can send email for your domain.

Your dns server need to have this configuration :

celogeek.fr. IN TXT "v=spf1 a mx ~all"

What the meaning of this ? It's a SPF entry that make your MX server trusted sender. They will be available to send mail in name of your domain (celogeek.fr in my case).

Have fun !