> Does any Edge MTA other than Microsoft Exchange support the client-side > of ATRN? No idea. I'd say ATRN is a dead subject besides being used by some exchange users and being offered by some ISPs (europe mostly, not sure why).
> > Are there enough ATRN-dependent Exchange shops with part-time or dynamic > Internet connections to justify this architecture? Can't say. If forced, i will say no, there aren't enough. > > Does Postfix also need an ATRN client? Postfix is the main choice for some important linux distros. Can't say i've heard users asking for atrn on their forums (thinking ubuntu at least). > > Is supporting ATRN worth the effort? It is an interesting problem to > solve, a cute intellectual puzzle, but perhaps our energies are best > directed elsewhere? Perhaps. In fact the main idea was to implement it as a totally decoupled postfix service while reusing postfix code as much as possible. That would also allow one to test user response by packaging it as a postfix extension in some linux distros. If positive, then one can safely decide its ok to merge to main tree. The only way one can doit is to dup the postfix source, code atrn service, do some proper maintenance against postfix source updates, test user response, if ok - only then think about patching smtpd. Now that you put the problem this way, if I would be a postfix developer i would vote against atrn support :) But i learned ways of doing things in postfix. Much appreciated. > > > ofcourse, there are many ways to implement fixes external to postfix > > but other things gets complicated (maintaining tunnels, cursing dynamic > > dns providers, etc). I dont know if i would vote for atrn inclusion in > > the main tree. > > Well, this would not be a simple outside the main tree add-on: > > - New address class required. > > - Some tweaks to the connection cache service. > > - Some tweaks to the SMTP delivery agent (when running in the > "atrn" personality, defer when no cached connection is available, > never try to connect to the nexthop directly). > > - Tweaks to the SMTP server to support a proxy mode after the ATRN > command is accepted. > > One could clone and customize smtpd, but then the body of code that is > common with smtpd would be maintained twice, this worked poorly with > smpt(8) and lmtp(8), and things are better now that the two are one. > > So I think that either this is mainstream Postfix, or you are completely > on your own with private patches that are unlikely to be suitable for > use anywhere else. > > -- > Viktor. > > P.S. Morgan Stanley is looking for a New York City based, Senior Unix > system/email administrator to architect and sustain our perimeter email > environment. If you are interested, please drop me a note. -- adrian ilarion ciobanu adria...@ciobanu.name http://pub.mud.ro/~cia +40 788 319 497
