On Thursday, February 27, 2003, 8:36:08 AM, Eric Shanbrom wrote: ES> In reality, when doing a store & forward there is no DNS resolution. IMail ES> will send the messages to the domain via the IP in the HOSTS file. If it did ES> a lookup and the primary server you are the backup for is down you would end ES> up with a loop (imail sending to itself) hence the HOSTS file lookup.
No, you wouldn't. RFC 2821 (Simple Mail Transfer Protocol) is quite explicit about this. Towards the end of section 5 (Address Resolution and Mail Handling) it states: If it determines that it should relay the message without rewriting the address, it MUST sort the MX records to determine candidates for delivery. The records are first ordered by preference, with the lowest-numbered records being most preferred. The relay host MUST then inspect the list for any of the names or addresses by which it might be known in mail transactions. If a matching record is found, all records at that preference level and higher-numbered ones MUST be discarded from consideration. -- [EMAIL PROTECTED] "The avalanche has already started, it is too Rod Dorman late for the pebbles to vote." � Ambassador Kosh To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
