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Floris
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From the Oxford English Dictionary, the origin of the expression "by return of post":

By return of post (F. par retour du courrier): orig. by return of the 'post' or courier who brought the dispatch (obs.); now, by the next mail in the opposite direction.

This certainly suggests that if an urgent reply was requested, one would mark the envelope as such and the messenger would wait for you to write the response immediately. In such cases, a 2 hour delay would depend on the distance (London was about 5 miles across in 1850, based on this map). As other answers explained, conventional mail deliveries happened all day long - obviously the point there was that one would want to minimize the delay for getting letters delivered from when they were written. That doesn't prove that everyone would respond immediately to every letter that came in - again, unless it was marked to indicate that an immediate response was required.

Urgent letters would be marked with "haste, post, haste" - this is the origin of the expression "post haste":

1590s, from a noun (1530s) meaning "great speed," usually said to be from "post haste" instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The verb post "to ride or travel with great speed" is recorded from 1550s.

Such marking would usually invite a rapid delivery, and quick reply.

From the Oxford English Dictionary, the origin of the expression "by return of post":

By return of post (F. par retour du courrier): orig. by return of the 'post' or courier who brought the dispatch (obs.); now, by the next mail in the opposite direction.

This certainly suggests that if an urgent reply was requested, one would mark the envelope as such and the messenger would wait for you to write the response immediately. In such cases, a 2 hour delay would depend on the distance (London was about 5 miles across in 1850, based on this map). As other answers explained, conventional mail deliveries happened all day long - obviously the point there was that one would want to minimize the delay for getting letters delivered from when they were written. That doesn't prove that everyone would respond immediately to every letter that came in - again, unless it was marked to indicate that an immediate response was required.

From the Oxford English Dictionary, the origin of the expression "by return of post":

By return of post (F. par retour du courrier): orig. by return of the 'post' or courier who brought the dispatch (obs.); now, by the next mail in the opposite direction.

This certainly suggests that if an urgent reply was requested, one would mark the envelope as such and the messenger would wait for you to write the response immediately. In such cases, a 2 hour delay would depend on the distance (London was about 5 miles across in 1850, based on this map). As other answers explained, conventional mail deliveries happened all day long - obviously the point there was that one would want to minimize the delay for getting letters delivered from when they were written. That doesn't prove that everyone would respond immediately to every letter that came in - again, unless it was marked to indicate that an immediate response was required.

Urgent letters would be marked with "haste, post, haste" - this is the origin of the expression "post haste":

1590s, from a noun (1530s) meaning "great speed," usually said to be from "post haste" instruction formerly written on letters (attested from 1530s), from post (adv.) + haste (n.). The verb post "to ride or travel with great speed" is recorded from 1550s.

Such marking would usually invite a rapid delivery, and quick reply.

Source Link
Floris
  • 351
  • 1
  • 6

From the Oxford English Dictionary, the origin of the expression "by return of post":

By return of post (F. par retour du courrier): orig. by return of the 'post' or courier who brought the dispatch (obs.); now, by the next mail in the opposite direction.

This certainly suggests that if an urgent reply was requested, one would mark the envelope as such and the messenger would wait for you to write the response immediately. In such cases, a 2 hour delay would depend on the distance (London was about 5 miles across in 1850, based on this map). As other answers explained, conventional mail deliveries happened all day long - obviously the point there was that one would want to minimize the delay for getting letters delivered from when they were written. That doesn't prove that everyone would respond immediately to every letter that came in - again, unless it was marked to indicate that an immediate response was required.