Single and multi-domain email systems installation, integration and support, with wide range of additional options i.e. antispam, antivirus, etc. Implementation of email services as on dedicated and/or virtual servers of customer, as on existing running multi-domain email system (Lighthunter.WS). Solutions based on postfix, dovecot, and other open source products. Secured corporate email subsystems with customized adaptation for specified customers business needs.