dovecot - Jan 2013 - E-mail not being processed into Dovecot folders

I have a new CentOS 6 server running Dovecot 2.0.9
It has current patches from CentOS.

Pasted below are the version and output from dovecot -n
When I run mail -s "test" username
test
<ctrl-D>
mail is written to /var/spool/mail/username
and not to /home/username/Maildir/

The user's client software, Thunderbird, logs in but since mail
is not written to Maildir it thinks there is nothing (see paste below 
from /var/log/maillog)

How do I get sendmail or what ever MTA processes mail to write to 
Maildir rather than /var/spool/sendmail?

[root at info2 Maildir]# dovecot --version
2.0.9
[root at info2 Maildir]# dovecot -n
# 2.0.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-279.19.1.el6.i686 i686 CentOS release 6.3 (Final)
disable_plaintext_auth = no
mail_debug = yes
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
passdb {
   driver = pam
}
protocols = pop3
ssl = no
ssl_cert = </etc/pki/dovecot/certs/dovecot.pem
ssl_key = </etc/pki/dovecot/private/dovecot.pem
userdb {
   driver = passwd
}
protocol pop3 {
   pop3_uidl_format = %v.%u
}


Jan 10 08:11:13 info2 dovecot: pop3-login: Login: user=<username>, 
method=PLAIN, rip=192.168.55.50, lip=192.168.55.8, mpid=30560
Jan 10 08:11:13 info2 dovecot: pop3(username): Debug: Effective uid=503, 
gid=503, home=/home/username
Jan 10 08:11:13 info2 dovecot: pop3(username): Debug: maildir++: 
root=/home/username/Maildir, index=, control=, inbox=/home/username/Maildir
Jan 10 08:11:13 info2 dovecot: pop3(username): Disconnected: Logged out 
top=0/0, retr=0/0, del=0/0, size=0

On Thu, 2013-01-10 at 08:15 -0500, stalker wrote:

> mail is written to /var/spool/mail/username
> and not to /home/username/Maildir/
> 

This has nothing to do with dovecot, its the MDA

> How do I get sendmail or what ever MTA processes mail to write to 
> Maildir rather than /var/spool/sendmail?

First you need to find out what SMTP server you are using, if it is
sendmail, it will work with maildir, but its much much more involved to
get it to, since its internal MDA mail.local, is mbox - better to avoid
headaches since you seem rather new at this, and use postfix (if you're
not already) since maildir (and mbox) is native to it,  place in main.cf

home_mailbox = Maildir/

long time since I've used system user accounts, but it should work then.

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