Email policy

To protect users and the GMX systems, GMX reserves the right to temporarily or permanently refuse to accept emails if at least one of the following conditions is not fulfilled:

GMX reserves the right to use external lists, such as IP lists (DNSBL lists) or hash lists to sort and reject emails.

In addition to this, GMX reserves the right to seek legal action against users who infringe on this email policy, or to temporarily or permanently block email reception for such users.

  1. The email header contains technical information on the process of sending an email. Most email programs and webmail interfaces hide the email header. In contrast to this, the email body (the text itself) is typically displaced. The body can be pure text or comprise multiple elements such as text and attachments.
  2. The HELO command is part of the SMTP protocol used for email delivery. With the help of this command, the email exchange between two servers gets initiated as the sending server transmits its full domain name. Analogous to that, a server indicates by means of the EHLO command that the extended SMTP protocol version (ESMTP) should be used.
  3. A Reverse DNS entry or FQDN (Fully Qualified Domain Name or PTR-RR) is the unique name of an internet host. The FQDN can be used to discover the host's IP address. The Reverse DNS entry should be used as the HELO when sending emails.