Answers for companies

The Business Knowledge Base is already largely up to date. A few individual articles are currently being revised and adapted. We thank you for your understanding and look forward to providing you with up-to-date information on using mailbox.

Please note: The knowledge base has changed slightly. Categories have been adapted and URLs stored in the old knowledge base may no longer be valid.

No connection to SMTP - POP3 - IMAP-Server

Connection problems with the mail server

A number of users have reported that they are unable to connect to our mail servers even though they have entered the correct access data and server name. This issue is almost always related to locally installed antivirus protection software that monitors the Internet connection and (for whatever reason) blocks the connection to our mail server.

Check whether a local firewall or another protection system might be blocking your access to the mail server.

Answers for companies

Connection problems with the mail server​

Connection problems with the mail server