'mail-sent' originates from the combination of 'mail' and 'sent', where 'mail' refers to the system of sending letters and packages, and 'sent' is the past participle of 'send', meaning 'to cause to go or be taken to a particular destination'.

'mail-sent' combines the Middle English word 'mail', derived from the Old French 'male', meaning 'bag or pouch', with 'sent', the past participle of 'send', from Old English 'sendan'.

Initially, 'mail' referred to a 'bag or pouch', but over time it evolved to mean the system of sending letters and packages, while 'sent' has consistently meant 'dispatched'.