Diom Webmail is a Web mail client written in PHP to interact with an IMAP server. It is easily configurable, with common features like sending and receiving messages and attachments, an address book, user configuration, and a spell check. It makes full use of MIME headers, and allows users to read and send messages with MIME content, like attachments and HTML messages. The look of Diom Webmail is easily customizable using a global CSS file. Configuration is run by a MySQL backend.