======== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.3
- Linux/BSD distribution name and version: Ubuntu 14.04.3 x64
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginz
- Manage mail accounts with iRedAdmin-Pro? No
- Related log if you're reporting an issue: mail postfix/smtpd[2510]: warning: smtpd_sasl_auth_enable is true, but SASL support is not compiled in
====

I attempted to upgrade Postfix to version 3.0.2 due to its ability to handle SMTP-UTF8 and therefore international email addresses (IEAs). However, after attempting to upgrade and then sending new mail, I get an error that says "SMTP Error (250): Authentication failed." The related log is copied above in the Required Information. Below are the commands that I used to upgrade and recompile Postfix 3.0.2. Can you see where I went wrong and offer a correction?

wget http://mirror.serversupportforum.de/postfix/official/postfix-3.0.2.tar.gz
tar xzf postfix-3.0.2.tar.gz
rm postfix-3.0.2.tar.gz
sudo apt-get build-dep postfix
cd /root/postfix-3.0.2
make clean
make
make install
postconf compatibility_level=2
make upgrade
shutdown -r now
postfix start