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Link to original content: https://support.apple.com/en-ge/guide/mail/aside/glosa7c138bb/13.0/mac/10.15

mail server - Apple Support (GE)

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mail server

A computer managed by an email account provider that acts as a digital post office and allows the transfer of email messages from sender to recipient. Outgoing mail servers (often called SMTP servers) handle messages being sent. Incoming mail servers handle messages being received. For IMAP accounts (such as iCloud or Gmail), copies of messages are stored on incoming mail servers until they are deleted.