On 23/Sep/10 01:00, Malcolm Weir wrote: >>From: Ben Kennedy [mailto:[email protected]] > >>With respect, I still find this argument somewhat specious. Virtually >>every enterprise of any size on the internet still runs multiple MX >>servers. While I appreciate that having a single point of reception >>means a simpler configuration, it also foregoes some measure of >>redundancy and versatility. Are Google and Apple and IBM and the White >>House out of their minds? I suppose that perhaps Courier is the wrong >>product for any such business, but if so, it seems an unfortunate design >>exclusion. In any case, that's getting off track. > > In my experience, enterprises of size actually operate dedicated boundary > servers as their MX platforms, and final delivery is handled by an entirely > different set of servers often totally invisible to the outside user.
While that's correct, those invisible servers are not _primary_ MXes on the public Internet. So, it is still unanswered why large enterprises may want to operate _secondary_ MXes, i.e. MXes with a higher preference number. It is possible to have multiple primary MXes (each one possibly multi-homed). For example, the White House doesn't seem to have secondary MXes: ;; QUESTION SECTION: ;whitehouse.gov. IN MX ;; ANSWER SECTION: whitehouse.gov. 10800 IN MX 105 mail1.eop.gov. whitehouse.gov. 10800 IN MX 105 mail2.eop.gov. whitehouse.gov. 10800 IN MX 105 mail3.eop.gov. whitehouse.gov. 10800 IN MX 105 mail4.eop.gov. (The same is true for ibm.com, but not for apple.com and gmail.com.) I agree that out-of-the-box Courier is the wrong product for a businesses running backup MXes, just like any other standard compliant SMTP server. The reason is that the traditional (non-filtering) design of secondary MXes is broken. This rules out the possibility of outsourcing backup MXes, which would be the most interesting solution for servers confined within a single RIR. -- http://fixforwarding.org/wiki/Backup_MX ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
