Thanks for your email.

Senin emailin için teþekküler.

XXX already sent it to me.

xxx bana zaten bu yolladý.

Probably not good Turkish but checking it will be understood please.

xxx bana zaten bu yolladý.

I think it should be ´onu´ not ´bu´

 I was going to use that but changed my mind!!!

Thanks Sonunda

xxx bana zaten (onu) yolladý.

If it is clear what he/sent to you, you may or may not say "onu".

If it is not clear, then say it and add -i suffix by the vowel harmony:

He already sent the money to me

Bana zaten parayý yolladý

 Thanks - it should be clear to him as I will reply to his email to me!

Thanks again