You may replace sendmail with another Message Transfer Agent such as qmail, exim or postfix. Set this up in sympa.conf

If you're using postfix as MTA, you have to set 'sympa.conf' like that :

## The full path to the Message Transfer Agent program (default is Sendmail 8.7
## or above)
sendmail        /usr/sbin/sendmail
# correct
# this binary is locating in the same directory as postfix
# sendmail       /usr/sbin/postfix
# (incorrect : must use Postfix to Sendmail compatibility interface)

The web interface allows user to create lists on the fly but each new lists needs a few mail aliases in order to used (unless your MTA is configured to recognize new list automatically). Sympa can be used with sendmail, postfix, exim and qmail.

• Using sympa_virtual with Postfix instead of regexp aliases
• handling /etc/mail/sympa.aliases with Exim4 (and Sympa >=5)
• Managing sympa aliases using sendmail
• Qmail and Sympa - setting up aliases

Only root can run the newaliases command in the latest versions of sendmail – so you needed to get Sympa to run the aliases updater as root. The smae trick that is used for to run wwwsypma.fcgi as the sympa user works on this as well:

1. Moving /home/sympa/sbin/alias_manager.pl to /home/sympa/sbin/alias_manager_sudo_wrapper.pl
2. Create new file /home/sympa/sbin/allias_wrapper.pl file needs to be:

   #!/usr/bin/perl
    
   exec '/usr/bin/sudo', '-u', 'root', '/home/sympa/sbin/alias_manager_sudo_wrapper.pl', "$ARGV[0]","$ARGV[1]","$ARGV[2]","$ARGV[3]";
   /var/sympa/sbin/

   ¹⁾

3. You need to make sure your sympa aliases file is owned by the sympa user. Sendmail will not like it if the file is group or everyone writable, but does not seem to care who actaully owns it.

   -rw-r--r--   1 sympa root   6003 Jan  8 12:05 sympa_aliases

4. Add this to your /etc/sudoers file:

   sympa localservername=(root) NOPASSWD:/home/sympa/sbin/alias_manager_sudo_wrapper.pl

5. Make sure that the sympa user is not a nologin user. It needs to be able have shell access to be able to sudo.