Yes - I have added a new, but very much related, question. So related that I consider it an expansion on the original question rather than a seperate question. Hence I didn't start another thread!

informal:
1.
Sevgili Julia, Dear Julia
...
HoşÃ§akal, Bye,
Marcel

2.
Merhaba Julia, Hello Julia
...
Sevgilerimle, with love
Marcel

Formal:
Sayın Julia Roberts, Dear Julia Roberts,
...
Saygılarımla, With regards,
Marcel Proust.

Please note that sevgili (dear)when used in fron of a name to adress to somebody, has nothing to do with sevgilim or sevgi (love).

So I'm suggesting that sevgili and sayın can be used the same way in which the first one is informal and the second one formal.
Also man can use sevgili when adressing to other man.
Sevgili Ahmet (Dear Ahmet),
Sevgili Arkadaşım (My Dear Friend)

Tesekker ederim Erdinc

PS Just wondering how they translate into English? I'm not sure about a couple of them.

Cheers

I edited my post above and have added the translations.
You can also double click on any Turkish or English word in our website. Cheers.

tesekkurler tekrar, Erdinc

georgette~
Between very close friends- the beautiful and very Turkish:

"Gözlerinizden öperim"

Elisa~
...even very close male friends might use this to close a letter. Saygılarımla would sound odd between close friends.

A correction:

"Gözlerinizden öperim" would most often be said from the older friend to the younger.

And the younger friend can say to the older one:
'Ellerinizden öperim/öpüyorum".