LEMP and Varnish: Sending mail not working

Move my wordpress site from another hosting (lamp) to digitalocean (lemp + varnish).

All nice, but mail sending dont work. If i check by trying reset my password, i have message “Possible reason: your host may have disabled the mail() function”. If i check by wp-mail-smtp plugin, i have message “Could not instantiate mail function.” (if use mail() function) or “SMTP Error: Could not connect to SMTP host” (if use SMTP)

But and mail(), and smtp is ok http://drugoyhiphop.ru/info.php