Delivery failure: Error transferring:Note item not found note item not fund

Hi,i am trying to send a mail from webaccess to specific internet address,getting error"Delivery failure: Error transferring to (gateway(send mail Ip address)Note item not found note item not fund"if i send same mail by LN client it delivered,i am also not able to open the same,

Any suggestion will be very much appreciate,

Regards

Shafi