I have a exim4 setup as SMTP. My user naming schema is to name all mail users for this server as m001, m002, m003, ... and then redirect to a real e-mail address with virtual domains.
How can I allow my users to authenticate with exim to send mail using either their system user name (m001) or the email address (email@example.com)?
User login information for m001 are stored in linux system files (passwd, shadow). They are linked thru entries in a virtual address table for each domain that this server can serve:
# /etc/exim4/virtual/example.com m001: firstname.lastname@example.org m002: email@example.com m003: firstname.lastname@example.org
The same can be applied to qpopper ?