What does the error User 1 set for local_mbx_delivery transport is on the never_users list mean?
A0632: You have configured the local_mbx_delivery to run as the user whose id (uid) is 1. However, this user is on the list defined by the never_users runtime option, or the FIXED_NEVER_USERS compile-time option. These are safety catch lists; Exim refuses to deliver to any user that is on them. The most common use of never_users is to avoid doing any deliveries as root, but it can contain other uids.
