Its functions include sending and receiving email, managing calendars, tasks, contacts,[1] notes, and chat (both XMPP-based and multichat such as Slack and MS Teams).

[4] eM Client has a range of features for handling email, including advanced rules management, mass mail, delayed send, or a built-in translator for incoming and outgoing messages.

[6] eM Client supports all major email platforms including Exchange, Gmail, Google Workspace, Office365, iCloud and any POP3, SMTP, IMAP or CalDAV server.

[7] Automatic setup works for Gmail, Exchange, Office 365, Outlook, iCloud, or other major email services.

[11] eM Client 10, released in 2024,[12] also provides AI features for composing messages and replies, Inbox categories and Quick Actions which allow users to create their own macros.