The instructions may only be applied to mailboxes that are not used for official purposes. For any official use (SHK, WHK, employees, ...), automatic forwarding of e-mails to external accounts (GMail etc.) is prohibited.
With the following steps you can forward all e-mails sent to your Exchange mailbox to an external mail address.
For more information regarding the inbox rules, see:  https://support.office.com/de-de/article/posteingangsregeln-in-outlook-web-app-edea3d17-00c9-434b-b9b7-26ee8d9f5622?ui=de-DE&rs=de-DE&ad=DE

 

OWA

  1. Call up the "Options" command under the settings icon Zahnrad-Symbol als Zeichen für Einstellungen . Select the category "E-mail" and the tab "Inbox and sweep rules". To create a new rule, select the plus sign +.

Erklärender Screenshot zur vorangegangenen Beschreibung.
Screenshot der Posteingangsregeln in der OWA.

 

  1. Assign a name for the rule and then open the pull-down menu under "When the message arrives, and it matches all of these conditions". Select "Apply to all messages". Then open the pull-down menu under "Do all of the following". Select the command "Redirect the message to..." under "Forward, redirect or send".

Erklärender Screenshot zur vorangegangenen Beschreibung.
Screenshot der Posteingangsregeln in der OWA.

 

  1. The Global Exchange Address Book opens. Select the input line "Redirect the message to..." and enter the desired target e-mail address (e.g. "abc@gmail.com").
    Attention: To prevent e-mail loops (endless loops), do not enter the TU-e-mail address (first name.last name@tu-dresden.de) here! Then confirm your entry with "OK".

Erklärender Screenshot zur vorangegangenen Beschreibung.
Screenshot des Eingabefelds für die E-Mail-Adresse der Weiterleitung.

 

  1. If you subsequently want to delete the forwarded e-mail in the Exchange mailbox, select "Add action". This adds new commands to the menu window. Select "Move, copy or delete", then "Delete the message" and then "Save".

 

  1. If you also want to save the forwarded e-mails in the Exchange mailbox, click on "Save" without making any further changes.

Erklärender Screenshot zur vorangegangenen Beschreibung.
Screenshot der Posteingangsregel-Einstellungen in der OWA.

 

  1. You must now answer a few system queries. Confirm with "Yes". This completes the creation of the forwarding. In the right-hand column you will see a summary of the rule content. To turn off the forwarding later, deactivate the checkbox in the "To" column.