Sending e-mails with non-registered mail addresses - Sender address rejected not owned by user
Sending mails with other sender addresses – Error messages
If you try to send a message with sender addresses other than the aliases you are using, you will receive a non-delivery notification with the text:
Sender address rejected: not owned by user
To prevent address forgery and misuse, you can only send mails with sender addresses that are registered for your account as a mail address or alias.
Path: All settings | Mail aliases
If you attempt to use sender addresses that we cannot assign to your account or that are not hosted at mailbox, the mails will be rejected with the error message:
553 5.7.1 wrongaddress@example.com
Normally, you should only use sender addresses that you have registered as a mail address or alias, so that you can also receive replies or bounce messages for these addresses. However, in a business environment it may sometimes make sense to use many different sender addresses, for example to assign processes to a specific user or because automated booking systems send many mails.
Technically, these addresses would also have to be registered individually as aliases. However, if a catchall is configured for the domain in the account (@example.com), any usernames of this domain can be used as senders – and conversely, it is ensured that replies to these addresses can actually be delivered.
Not affected and still usable
- Primary address
- all aliases
- Mail extensions
- Alternative senders
- Disposable addresses
