It features rich text support and inline spell checking,[3] spam filtering (both automated and Bayesian), a contact manager, and supports POP3 and IMAP, newsgroups, and Atom and RSS feeds.

Opera Mail can also use Bayesian filtering to automatically sort messages into other views.

The integrated mail component included a simple IRC client, but this is no longer present in the standalone program.

The IRC client supported multiple servers, file transfers, and interface customization through CSS.

Users of Opera Mail who have large amounts of email and would like to utilize 64-bit performance can use the 64-bit build of the Opera Web Browser, which is the same code contained in the standalone email client.