Website example.com shows webmail content instead of website content on Plesk server

Symptoms

• Website example.com shows webmail content instead of website content.
• example.com is set as  Default site for Plesk IP under Plesk > Tools & Settings > IP Addresses:
  
• Only webmail configuration files are existing for the domain:

  Debian/Ubuntu:

  # apache2ctl -S | grep example.com
  port 7081 namevhost webmail.example.com (/etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf:39)
  port 7080 namevhost webmail.example.com (/etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf:5)

  RHEL/CentOS:

  # find /etc/httpd/ -name "example.com*"
  /etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf
  /etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf.bak

• Apache access logs are being filled with "plesklog" entries:

  # tail /var/www/vhosts/example.com/logs/access_log
  plesklog
  plesklog
  plesklog

Cause

The server.conf file is not specified in the Apache2zz010_psa_httpd.conf file:

Debian/Ubuntu:

# grep server.conf /etc/apache2/conf-enabled/zz010_psa_httpd.conf
#

RHEL/CentOS:

# grep server.conf /etc/httpd/conf.d/zz010_psa_httpd.conf
#

Resolution