On Fri, 3 Jul 2009, Gábor Lénárt wrote: > On Fri, Jul 03, 2009 at 09:55:40PM +1000, Barney Desmond wrote: > > > Recently I am thinking of reimplementing our MX servers. Of course rcpt > > > check is a must, also I should not generate NDRs later, I should only > > > accept > > <snip> > > > > This is all very standard behaviour for an MTA. Recipient checking is > > a very common task for most Postfix users. Regardless of what you > > expect or want, SMTP is a store-and-forward protocol - queues are a > > strong component for an MTA. > > I don't think so, SMTP itself is just a protocol, you can use it without > having and storage too. It's another question that how useful it is then ...
SMTP is a store-and-forward protocol, it does require queues. You cannot simply wave aside this requirement. I think it cannot be solved with an SMTP proxy "without queues" either: the final destination must queue the message first. After that it can attempt a local delivery, which may fail, for example due to the user being over quota. Therefore at the proxy side you also have to maintain the mail queue. Best regards, Jozsef - E-mail : kad...@blackhole.kfki.hu, kad...@mail.kfki.hu PGP key : http://www.kfki.hu/~kadlec/pgp_public_key.txt Address : KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest 114, POB. 49, Hungary
