Hello, We are having issues sending messages through a SMTP server (Exchange). Apache error log registers the following: . . . [Fri Mar 20 16:06:16 2009] [error] [client 172.26.129.108] ERROR: OTRS-CGI-10 Perl: 5.8.8 OS: linux Time: Fri Mar 20 16:06:16 2009, referer: http://172.26.129.21/otrs/customer.pl?Action=CustomerTicketZoom&TicketID=87 [Fri Mar 20 16:06:16 2009] [error] [client 172.26.129.108] , referer: http://172.26.129.21/otrs/customer.pl?Action=CustomerTicketZoom&TicketID=87 [Fri Mar 20 16:06:16 2009] [error] [client 172.26.129.108] Message: Can't send message: 550Start mail input; end with <CRLF>.<CRLF>, referer: http://172.26.129.21/otrs/customer.pl?Action=CustomerTicketZoom&TicketID=87 [Fri Mar 20 16:06:16 2009] [error] [client 172.26.129.108] 5.7.1 Client does not have permissions to send as this sender, referer: http://172.26.129.21/otrs/customer.pl?Action=CustomerTicketZoom&TicketID=87 [Fri Mar 20 16:06:16 2009] [error] [client 172.26.129.108] ! Enable Net::SMTP debug for more info!, referer: http://172.26.129.21/otrs/customer.pl?Action=CustomerTicketZoom&TicketID=87 . . . We checked that through a common email client we are able to send messages but no through otrs. We can´t find how to turn on this debug. Is this an Apache config, otrs config...? Thanks.