Mail Servers

A mail server (sometimes also referred to an e-mail server) is a server that handles and delivers e-mail over a network, usually over the Internet. A mail server can receive e-mails from client computers and deliver them to other mail servers.  An advanced mobile phone or Smartphone, with e-mail capabilities, can be regarded as a client computer in these circumstances. Mail servers can be broken down into two main categories: outgoing mail servers (known as SMTP) and incoming mail servers (POP3/IMAP). Servers always store copies of messages on servers.


Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems

Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, written primarily with security in mind.

Horde is a free web-based groupware. The components of this groupware rest on the Horde framework. This PHP-based framework provides all the elements required for rapid web application development


As email becomes one of the most popular means of communication and doing business, loss of confidential information via Mail servers exploits can result in large financial losses. It’s also important for a server to run stably so that users are able to access it at any time. When a server is unstable it may be hacked into, which can lead to the loss of data and profit.

Previously, we had identified various vulnerabilities in Mail Server products such as an Horde Groupware Webmail Edition Remote Code Execution or a SquirrelMail – Incoming e-Mails Stored XSS and MDaemon Mail Server Multiple XSS Vulnerabilities.

Think you figured out how to run unauthenticated commands on Postfix? Found a Dovecot vulnerability and don’t know what to do next? Let us be your guides!