/etc/ax25/logins is in ax25mail-utils 0.13-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # /etc/ax25/logins
#
# This file defines the callsigns corresponding with logins
#
# The format of this file is:
#
# login callsign
#
root ok2xxx
radek ok2jbg
|