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Retrieving all emails sent to the domain, without having to specify an e-mail address each time
You use firstname.lastname@example.org but wish to receive e-mails even if the sender gets the address wrong (email@example.com, firstname.lastname@example.org, etc). With a catchall address, a sender getting the address wrong will not receive an error message and you can check corresponding e-mails by logging in to the catchall address email@example.com.
Creating a "catchall" address
On your Mail hosting, create a new email address (help).
It should actually be named "catchall" if you wish to receive all the emails for which there is no specific address on your domain.
However, we would advise against creating this account because it also retrieves all the spam and viruses; after a wave of spam, it therefore runs the risk of being completely swamped. It is better for senders to receive an error message warning them that the e-mail address they specified does not exist so that they do not continue to use it as a recipient address.
What is more, if you configure an auto-reply function on a catchall@ address on your domain, no automatic reply will be sent to the people sending a message to an address which does not exist on the domain.