А это лог, когда нажимаешь "Подтвердить заказ"
[Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: PHP message: PHP Fatal error: Uncaught exception 'Exception' with message 'Error: MAIL FROM not accepted from server!' in /home/srv115873/detiru.ru/system/library/mail.php:323, referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: Stack trace:, referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #0 /home/srv115873/detiru.ru/system/storage/modification/catalog/model/checkout/order.php(683): Mail->send(), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #1 [internal function]: ModelCheckoutOrder->addOrderHistory(23, '2', '\\xD0\\x98\\xD0\\xBD\\xD1\\x81\\xD1\\x82\\xD1\\x80\\xD1\\x83\\xD0\\xBA\\xD1...', true), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #2 /home/srv115873/detiru.ru/system/storage/modification/system/engine/loader.php(178): call_user_func_array(Array, Array), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #3 [internal function]: Loader->{closure}(Array, Array), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #4 /home/srv115873/detiru.ru/system/engine/proxy.php(25): call_user_func_array(Object(Closure), Array), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #5 /home/srv115873/detiru.ru/catalog/controller/extension/payment/bank_transfer.php(30): Proxy->__call('addOrderHistory', Array), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:18 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #6 /home/srv115873/detiru.ru/catalog/controller/extension/payment/bank_transfer.php(30): Proxy->addOrderHistory(23, '2', '\\xD0\\x98\\xD0\\xBD\\xD1\\x81\\xD1\\x82\\xD1\\x80\\xD1\\x..., referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:20 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: PHP message: PHP Fatal error: Uncaught exception 'Exception' with message 'Error: MAIL FROM not accepted from server!' in /home/srv115873/detiru.ru/system/library/mail.php:323, referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:20 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: Stack trace:, referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:20 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #0 /home/srv115873/detiru.ru/system/storage/modification/catalog/model/checkout/order.php(846): Mail->send(), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:20 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #1 [internal function]: ModelCheckoutOrder->addOrderHistory(23, '2', '\\xD0\\x98\\xD0\\xBD\\xD1\\x81\\xD1\\x82\\xD1\\x80\\xD1\\x83\\xD0\\xBA\\xD1...', true), referer: http://detiru.ru/index.php?route=checkout/oct_fastorder [Wed Nov 21 11:04:20 201] [error] [client 78.30.245.222] FastCGI: server "/usr/lib/cgi-bin/php56-fcgi" stderr: #2 /home/srv