Good Afternoon,everyone! My OTRS is 3.3.7，I have configured : Core::Admin Email Core::Sendmail Core::NotificationSenderEmail System EmailAddress all above is the same mail_address. Now I can received the mail when customer and agent forgot the password. But I can not received the mail when customer or agent create new ticket,and otrs.log display: [Fri Jun 27 13:33:02 2014][Notice][Kernel::System::CustomerAuth::DB::Auth] CustomerUser: XXX@customer_company.com Authentication ok (REMOTE_ADDR: 192.168.1.120).[Fri Jun 27 13:34:07 2014][Info][Kernel::System::Ticket::TicketCreate] New Ticket [2014062705000047/notification ma] created (TicketID=5,Queue=Raw,Priority=3 normal,State=new)[Fri Jun 27 13:34:08 2014][Error][Kernel::System::Email::SMTP::Send][122] Can't use from '': 501Username and sender address mismatched! Enable Net::SMTP debug for more info![Fri Jun 27 13:34:08 2014][Info][Kernel::System::Email::Send] Error sending message[Fri Jun 27 13:34:08 2014][Info][Kernel::System::Ticket::Article::SendAgentNotification] Sent agent 'NewTicket' notification to servicedesk@mycompany.com'.