Jobs (DE)Terms of UsePrivacy PolicyLegal Notice

Mailqueue status messages

If DEFENDO's mail server fails to deliver an email you can find further information in "Monitoring > Mail server". The following list explains the most common messages:
host map: lookup (DOMAIN): deferred
Name resolution of the target domain failed. This can be caused by problems with DEFENDO's or an upstream DNS. There could also be a problem with the recipients domain itself.
IO error
An in transit error occured. Maybe the dial-up connection hung up while delivering the mail or the recipient mail server terminated the connection (e.g. because the delivery of a very large mail took too long).
Connection refused
The recipient mail server is down. If outbound mail is forwarded to the relay of your provider you should check the configuration or contact the provider.

Secure

DEFENDO forces a collection of best-of-breed security modules like firewall, VPN, proxies, virus scanner and anti spam system to interact for one purpose:
To be protected from all online threats and unwanted contents like malicious code, spam and hacker attacks.

Flexible

Each IT scenario is different. The DEFENDO product family will adapt precisely to your demands.
DEFENDO applies for simple Internet connections of small companies, for headquarters / branch office WANs, as well as for complex multi-tiered firewall systems.

More good reasons

  • No backdoors
  • More than 20 years of Internet security experience
  • Award-winning product
  • Support by our development engineers
  • Reseller loyalty
  • Made in Germany