       qmail-upgrade - user-visible differences between qmail and
       sendmail

INTRODUCTION

       You will notice some differences when the system  switches
       from sendmail to qmail.

       1.   qmail-alias  sends  incoming  mail to ~you/Mailbox by
            default, not /usr/spool/mail/you.  Your system admin-
            istrator  has  changed your MAIL environment variable
            so that your  mail  reader  looks  for  ~you/Mailbox.
            (/usr/spool/mail is a massive security problem.)

       2.   qmail-alias  pays no attention to .forward.  It has a
            much better mechanism, .qmail, so that you can handle
            not  only forwarding but even your own mailing lists.
            See below for more details.

       3.   qmail-alias pays no attention to /etc/aliases.   Your
            system  administrator  can  use  the .qmail mechanism
            instead.  See below.

       4.   qmail does not support the \you mechanism for  ignor-
            ing aliases.  The .qmail mechanism is much more flex-
            ible; see below.

       5.   qmail-inject has a  completely  different  philosophy
            from  sendmail  on  interpreting  non-fully-qualified
            host names.  It uses  fixed  rules,  not  DNS.   Some
            examples at UIC:

                 russet -> russet.math.uic.edu
                 newton -> newton.math.uic.edu
                 ut.ee  -> ut.ee  (a host in Estonia)
                 ut.ee+ -> ut.ee.uic.edu
                 uicvm+ -> uicvm.uic.edu

            Here the default domain name (for hosts without dots)
            is math.uic.edu, and the plus domain name is uic.edu.

       6.   Unlike  sendmail,  qmail-inject  doesn't replace host
            names with canonical  names.   Example:  qmail-inject
            won't  change  postmaster@ftp.cs.berkeley.edu in your
            header  to  postmaster@kohler.cs.berkeley.edu.    The
            sendmail  documentation  claims  that  qmail-inject's
            behavior is illegal under RFC 822 and RFC 1123;  that
            claim is based on a questionable interpretation of an
            ambiguous phrase in RFC 822.  Besides, do you want to
            have hostnames changed behind your back?

       7.   qmail-alias  adds  a  new field, Delivered-To, before
            every delivery.  It uses the contents of Delivered-To
            qmail-inject will add Cc: recipient list not shown:;,
            rather than sendmail's privacy-invading Apparently-To
            header field.

QMAIL MAILING LISTS

       sendmail deals with aliases, forwarding, and mailing lists
       at the very heart of the mail system.

       qmail  takes a radically different approach.  It gives you
       the power to set up your own mailing lists without pester-
       ing your system administrator.

       Under  qmail,  you  are  in charge of all addresses of the
       form you-anything.  The delivery of you-anything  is  con-
       trolled  by  ~you/.qmail-anything,  a  file  in  your home
       directory.

       For example, if you want  to  set  up  a  sick-of-sendmail
       mailing  list,  you  can  put  a  list  of  addresses into
       ~you/.qmail-sos.  Any mail to you-sos will be forwarded to
       all  of  those  addresses.   Mail  directly to you is con-
       trolled by ~you/.qmail.  You can even set up a  catch-all,
       ~you/.qmail-default, to handle unknown you- addresses.

       Your .qmail files, like your old .forward, may list files,
       forwarding addresses, or  other  programs  to  run.   (But
       beware  that  the  syntax  is  a  bit  different; see dot-
       qmail(8) for  more  details.)   qmail-alias  automatically
       detects  forwarding  loops the instant they occur, even if
       they happen indirectly through other hosts.

       As a helpful special case, if a .qmail file is  empty,  it
       refers   to  ~you/Mailbox.   For  example,  if  you  touch
       ~you/.qmail-direct, mail for you-direct will act like \you
       did under sendmail.

       Addresses that don't contain a username are handled by the
       alias user.  For example, your  system  administrator  has
       set  up  ~alias/.qmail-postmaster to handle mail for Post-
       master.  (Note to administrators: ~alias doesn't apply  to
       addresses that start with a user name, with certain excep-
       tions.)

INTRODUCTION

QMAIL MAILING LISTS

SEE ALSO