We recently had a hard time sending email as well using our ISP's DNS. It ended up they had setup new DNS servers with new IP's and were in the process of shutting the old ones down. You may want to contact your ISP and ask for the most up to date DNS list.
-----Original Message----- From: Scott Burgin [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 02, 2001 1:36 PM To: MS-Exchange Admin Issues Subject: Exchange 5.5 outgoing external email Our outgoing smtp email suddenly quit working. There is no error codes on the exchange 5.5 server. Incoming smtp works and all internal email works. It's been rebooted. Event viewer show no problems. Here is the messages I get when sending out: 501 5.1.8 <[EMAIL PROTECTED]>... Domain of sender address [EMAIL PROTECTED] does not exist The message that caused this notification was: It says "domain of sender address does not exist" We use our ISP's DNS servers. Is that the problem? I can nslookup the DNS server that is listed in the exchange server and it does resolve our domain name. ANy ideas? List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
