After updating DirectAdmin to the latest version,1.5, Custombuild 2.0(first installation) and Custombuild DirectAdmin plugin my sites on my VPS like for example a Xenforo forum are unable to send mails. Please advice? Zend_Mail_Transport_Exception error Zend_Mail_Transport_Exception: Email to ***@****.com failed: Unable to send mail. - library/Zend/Mail/Transport/Sendmail.php:137 Code (markup): Options.config Executing /usr/local/directadmin/plugins/custombuild/admin/build options... Apache: 2.4.20 mod_ruid2: 0.9.8 ModSecurity: no Dovecot: 2.2.22 Dovecot configuration: yes AWstats: no Exim: 4.87 exim.conf update: no BlockCracking: no Easy Spam Fighter no SpamAssassin: no ClamAV: no MySQL: no MySQL backup: yes MySQL backup directory: /usr/local/directadmin/custombuild/mysql_backups PHP (default): 5.5 as mod_php phpMyAdmin: 4.6.0-all-languages ProFTPD: no Pure-FTPd: 1.0.42 RoundCube webmail: 1.1.4 Replace "php.ini" with '/usr/local/directadmin/custombuild/build all' and '/usr/local/directadmin/custombuild/build php_ini': no Auto updates/notifications: no Run "clean" every time: yes Run "clean_old_webapps" every time: yes Run "clean_old_tarballs" every time: yes Show texts in bold: yes SquirrelMail: 1.4.23-20150507_0200 Zend Guard Loader: no ionCube loader: no Suhosin: no Apache: 2.4.20 mod_ruid2: 0.9.8 ModSecurity: no Dovecot: 2.2.22 Dovecot configuration: yes AWstats: no Exim: 4.87 exim.conf update: no BlockCracking: no Easy Spam Fighter no SpamAssassin: no ClamAV: no MySQL: no MySQL backup: yes MySQL backup directory: /usr/local/directadmin/custombuild/mysql_backups PHP (default): 5.5 as mod_php phpMyAdmin: 4.6.0-all-languages ProFTPD: no Pure-FTPd: 1.0.42 RoundCube webmail: 1.1.4 Replace "php.ini" with '/usr/local/directadmin/custombuild/build all' and '/usr/local/directadmin/custombuild/build php_ini': no Auto updates/notifications: no Run "clean" every time: yes Run "clean_old_webapps" every time: yes Run "clean_old_tarballs" every time: yes Show texts in bold: yes SquirrelMail: 1.4.23-20150507_0200 Zend Guard Loader: no ionCube loader: no Suhosin: no Done! Code (markup):