Write Someone vs Write To Someone

[Volcano1985]

Which one is correct?

[Shyone]

I usually write a letter to someone, but I'm writing someone a letter.
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No comment

[Meg1571]

It depends on the placement of the indirect object (someone, Mary, the company, etc.) and the direct object (letter, note, message, etc.) If the indirect object comes first, you don't use "to".

I am writing someone a message.
Dave writes Mary a letter every week.

If the direct object comes first, then use "to".

I am writing a message to someone.
Dave writes a letter to Mary every week.

:o