'promptly-sent' originates from the combination of 'promptly' and 'sent', where 'promptly' means 'without delay' and 'sent' is the past participle of 'send'.

'promptly' and 'sent' have been used in English since the Middle Ages, with 'promptly' deriving from the Latin 'promptus', meaning 'ready', and 'sent' from the Old English 'sendan'.

Initially, 'promptly' meant 'readily' or 'eagerly', but over time it evolved to mean 'without delay'.