![]() ![]() ![]() Proton Mail supports SMTP and IMAP via Proton Mail Bridge. These are software programs that likely still use protocols such as SMTP and IMAP, but which hide the internal details in a user-friendly way so you don’t need to do any manual configuration in your email client. In practice, the job of connecting email clients with mail servers is increasingly handled by application programming interfaces (new window) (APIs). This is partially addressed by an option to not delete emails from the mail server once they have been retrieved, but IMAP handles syncing emails across clients much better. The downside of this simplicity is that POP3 offers no advanced email management functions.īecause POP3 deletes emails from the mail servers once they have been retrieved, it is not very useful for synchronizing emails across different devices. POP3 supports various secure authentication methods, and its simplicity is sometimes seen as one of its key strengths. Deletes copies of the downloaded emails from the email server. ![]() ![]() The email client connects to the mail server (usually over TCP port 995, assuming a secure TLS connection).ģ. POP3 is a simple protocol that usually works in the following way:ġ. Like IMAP, POP3 is an incoming email protocol, meaning that it is used to retrieve emails from a remote server to an email client. POP3 is the latest version of the Post Office Protocol (new window) (POP), and is a legacy standard not often used anymore. This means when you connect to the server using IMAP on a different device, all changes are synced. When connected to a mail server using IMAP, any changes you make, such as replying to emails, deleting them, or moving them to other folders, occurs on the mail server. Messages are not deleted from the server (unless you choose to delete them, but even then they will probably be placed in a Trash folder by default rather than deleted outright). With IMAP, emails are individually downloaded only when you click to view them. ![]()
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