How are reports of abuse, spam, and technical problems handled?
For your convenience, the Google Team monitors all mail sent to the addresses email@example.com and firstname.lastname@example.org to ensure that we can properly address all reports of spam, abuse, and technical issues. Since abuse and postmaster are reserved aliases, you can't use them as usernames or nicknames.
If you want particular users in your organization to receive mail sent to email@example.com and firstname.lastname@example.org, you can create groups named abuse and postmaster. Users that are part of these groups will receive mail sent to those addresses. The Google Team will still receive the mail as well.
Learn more about how to create a group.
Because of their special status, you can only create the abuse and postmaster groups using the Google Admin console. You can't create the groups using Google Groups.