Hector Santos wrote: > I have to see if our GL people are comfortable enough with GL to justify > adding a RCPT TO rejection option.
[Aside: I think "General Ledger" when I see GL... but anyway...] Tempfailing RCPT commands will cause interoperability problems with certain broken SMTP implementations, specifically ones from Lotus. Here's what happens. S is the server doing greylisting and C is the broken Lotus client: S: 220 foo.example.com ESMTP C: HELO busted.lotus.box S: 250 foo.example.com Hello busted.lotus.box C: MAIL FROM:<[EMAIL PROTECTED]> S: 250 Go ahead C: RCPT TO:<[EMAIL PROTECTED]> S: 451 Greylisting in effect, try again later C: RCPT TO:<[EMAIL PROTECTED]> S: 451 Greylisting in effect, try again later C: DATA S: 503 Need valid recipient first C: QUIT at which point busted.lotus.box generates a non-delivery notification. Sad, isn't it? Regards, David.
