The client has several websites with different content, every site has significant traffic and many registered users. The job was to develop a platform for creating and executing various email marketing campaigns for external clients. Clients’ business is based on selling ad space in the newsletters they had on all sites, as well as selling special e-mailings to double opt-in email addresses. This platform has an advanced system for email validation written in PERL, together with PHP engine for delivering large amounts of emails in a very short time. The database had several hundreds of thousands of records, so we had to optimize tables and SQL queries to accomplish high speed of software.