Update pages/01.administrate/07.specific_use_cases/10.vpn/vpn_advantage.en.md

Co-authored-by: Éric Gaspar <46165813+ericgaspar@users.noreply.github.com>
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@ -26,7 +26,7 @@ With a neutral VPN, this problem is circumvented because the VPN can be compared
### The case of email
Email is one of the most complex protocols to self-host, usually it is what a user self-hosts last. Indeed, it is very easy to find yourself in a situation where emails sent by the server are refused by the recipient SMTP servers.
To avoid this you need to :
To avoid this you need to:
- configure the reverse DNS of the server's Internet connection (or VPN)
- a fixed IPv4
- that this IPv4 is removable from all blacklists (notably the IP must not be on the DUL)