Okla. Stat. tit. 21, § 21-29: Sending letter - When complete - Place of prosecution

In the various cases in which the sending of a letter is made

criminal by this chapter, the offense is deemed complete from the

time when such letter is deposited in any post office or any other

place, or delivered to any person with intent that it shall be

forwarded. And the party may be indicted and tried in any county

wherein such letter is so deposited or delivered, or in which it

shall be received by the person to whom it is addressed.