Hey Juan, If it was working before then I would check your DNS to see if anything has changed or if it is having problems. Also is your mail leaving from the Sendmail server or being forwarded to your Exchange server and sent out? Thanks, Jeff -----Original Message----- From: Juan Ibarra [mailto:jibarra@xxxxxxxxxxx] Sent: Tuesday, June 04, 2002 7:53 PM To: [ExchangeList] Subject: [exchangelist] Issues sending an email http://www.MSExchange.org/ - Re-Vamped! Scenario: I am having an issue with exchange when trying to auto send an email from a sun machine to an external email address (vendor). the email is send as web@xxxxxxxxxxx <mailto:web@xxxxxxxxxxx The recipient is doing a lookup to verify the host/domain (an internal machine), and sends a bounce-back because it cannot resolve the host/domain. The sendmail header on the UNIX server is configured to show the recipient this: user@xxxxxxxxxxxx I tried to masquerade the From header to this: user@domain. It did not work. It was working before just fine. Does anyone has any input on this? Thanks Juan ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: heffe@xxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')