strange characters sending newsletters

I've just created a new website myscan.it with an imported db from another working website 100asa.it
Now when I'm sending newsletters the only firts green flag show me, and then a great number of strange characters (ascii???)
like this ```html
"ÙŽD=S•˜—éP–Z’j&ƒ«=CKCû(Ú ���ÿÿ"ÃnPï>ù9™ùÀîMN&š•Øä6���ÿÿ"Ã& hPNN¦LD³Ch���ÿÿ"ÝŽ¤Ô’L‡bP—,µÍt) ù����ÿÿ"Ã| “3

and I think my new zencart don't send any newsletters.
I'm trying with varios email settings, but it's the same.
Instead if I send a single mail, all work fine.
Can it solved?

Try turning off the gzip compression. i had the same problem, and that was my issue. Under Admin/config.

:clap:

Great!!! work fine!
Thank you

Happy too soon!
I've tryed to send newsletters, but it seems don't send it.
Admin, customers, all.... none newsletter arrive!
Instead, sending single email, it arrive to destination.
What can it be?

none, all works fine!