"delivered by post" is correct and can be used in written English.
It is typically used to describe something that is sent or received through the mail. Here is an example: "The package was delivered by post three days after I placed the order."
Women who did not respond to this letter were then offered up to two appointments for home interviews at a specified time (one delivered by post, one by a hand-delivered visiting card).
Start off by downloading (or having delivered by post) the LiveCD of Ubuntu.
They are delivered by post the next day, provided you order before noon.
Dealers across the world sold all manner of illegal substances, usually delivered by post.
A day or so later I replaced the golf balls she had been brooding with fertile eggs delivered by post.
Throughout the noughties, the explosive growth of internet shopping prompted many businesses to explore ways of exploiting this relief, focusing on low-value goods easily delivered by post.
You can also use General Delivery for overnight packages delivered by the post office.
The translation, which Warner claims was delivered "by return post" is clear and precise but nothing more, and its occasional Irish colloquialisms are incongruous.
The questionnaire was delivered by ordinary post during spring 2010.
'Enhanced' letters, letters delivered by priority post or additional reminders were also no more effective than standard communication.
The addition of a non-monetary incentive, an offer of a non-monetary incentive compared with no incentive or, 'enhanced' letters, letters delivered by priority post, or additional reminders compared with standard communication strategies did not increase or decrease trial questionnaire response.
