Make sure you have a ptr record for your mail server in your DNS. Sander
-----Original Message----- From: Olivier de Heer [mailto:[EMAIL PROTECTED]] Sent: 02 July 2002 08:30 To: Exchange Discussions Subject: Fix reverse DNS (?) Dear All, Some of our customers do receive the following NDR when sending messages to one of the domains residing in our Exchange organisation. Your message has encountered delivery problems to the following recipient(s): [EMAIL PROTECTED] Delivery failed 550 5.7.1 Fix reverse DNS for [IP-address of our Mailsweeper system],or use your ISP server Sent: MAIL FROM:<[EMAIL PROTECTED]> Received:550 5.7.1 Fix reverse DNS for [IP-address of our Mailsweeper system],or use your ISP server Does anyone know how we can solve this issue? Many thanks in advance, Olivier _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
