ok, both of my examples are right. but, if you want to translate it word by word then use the 1st one: 'Bu mesajı, sana Atina'daki SYNTAGMA'dan yolluyorum.'
you're welcome!
by the way, (I used copy/past) and I just noticed a mistake 'yolliyorum' it should be 'yollUyorum'. I alredy edited and I can accept the translation now.
but just to let you know, you can use 'gönderiyorum' also. (gönderiyorum is better)