Auto response error

[nicollas]

My auto response was working fine, but now is giving error when the user create a ticket.

Mon Nov 26 14:42:40 2012 notice OTRS-CGI-10 Sent auto response (SendAutoReply) for Ticket [2012112610000023] (TicketID=378, ArticleID=) to 'User <user-mail@>'.
Mon Nov 26 14:42:40 2012 error OTRS-CGI-10 Impossible to send message to: User<user-mail@> .
Mon Nov 26 14:42:40 2012 info OTRS-CGI-10 Error sending message
Mon Nov 26 14:42:40 2012 error OTRS-CGI-10 Can't send to 'user-mail@': 5545.7.1 <user-mail@>: Recipient address rejected: Access denied


I dont change anything.

my OTRS version is 3.1.7 - SO: Linux Debian Squeeze.

[jojo]

please check with your mail server provider. The mail server is rejecting it

[nicollas]

Check the mail server who send or the mail server that receive?

[crythias]

The sender has sent you an email with an improper "From" address. You should talk to the sender about crafting a proper email or it's a Phone Ticket that an agent created in a Queue that was created with a customer without an email domain.

[nicollas]

But, when i try to send the notification with the same mail of auto response, the notification is sucessfull sending, or when i try to forward the ticket to another agent the message is received.

Only the auto response is not sucessfull send.