E-mail guidelines

The following applies to the delivery of Internet e-mails through the Proximus network:

• Proximus mail servers will not accept connections from unsecured systems. These include open relays, open proxies, open routers, or any other system that has been determined to be available for unauthorized use.
• Proximus mail servers will not accept connections from systems that use dynamically assigned or residential IP addresses.
• Proximus mail servers will reject connections from any IP address that does not have a reverse DNS (PTR).
• Proximus may reject connections or mails from senders whose recipient lists consistently generate a higher than 10% bounce failure rate (i.e. over 10% of a sender's mailing list is destined for users that do not exist on our systems).
• Proximus may reject connections or mails from senders who are unable to accept bounce-return messages destined for their domain.
• If you are using our webmail solution, you can include up to 25 addressees per e-mail.
• If you are using an e-mail client, you can include up to 100 addressees per e-mail.
  Please note: on other networks than the Proximus network, you are limited to 10 e-mail addresses simultaneously per e-mail via an e-mail client.
• The owner of a fixed IP address that has been blacklisted can contact us.