Most SMTP servers will try all listed MX records (in increasing preference order) prior to queuing for later delivery.
Your assumption is correct that mailgate1 would receive all inbound traffic (to its connection limits). ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Peregrine Systems Atlanta, GA > -----Original Message----- > From: Adam Romain [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, April 23, 2002 5:50 AM > To: Exchange Discussions > Subject: DNS behaviour with MX preferences... > > > Guys, > > I'm trying to fully understand what happens with MX > preferences and SMTP relays. > > Let me draw a picture. Lets says a company has 2 SMTP > inbound connections for domain name example.com and the MX > records show that example.com has 4 servers that will accept > the mail. i.e. mailgate1.example.com pref = 10, > mailgate2.example.com with pref = 20, fallback1.isp.com pref > = 50 and fallback2.isp.com pref = 50. > > If mailgate1 is always available, will it be the only > connector that takes the mail unless it has reached the > maximum number of sessions ? > > If mailgate1 is down, how quickly does the sending SMTP > connector give up and try the next MX record pref, i.e > immediately or after a certain retry parameter ? > > TIA > > Adam Romain > ********************************************************************** > This email and any files transmitted with it are confidential > and intended solely for the use of the individual or entity > to whom they are addressed. If you have received this email > in error please notify the system manager. > > Network Defence Ltd > ********************************************************************** > > _________________________________________________________________ > 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]
