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Postings from September 2007
I dug around some more and it looks like Net::SMTP actually has a ->status() method from its superclass Net::Cmd and returns the most significant digit. I modified my smtp-forward to look at the ->status() flag and return DENY if it's 5, otherwise return DECLINED. Seems to work well so far. Let me know if anybody is interested in the code - it's a quick ugly hack but made smtp-forward behave much more like a proxy. Thanks, Tim On 09/09/2007 4:57 AM, Tim Tsai wrote: > I have been playing with qpsmtpd in more unusual configurations on > personal domains belonging to myself and some friends. I noticed > recently that one of the domains has been getting 30-40 spams per > SECOND to invalid mailboxes. I am guessing this is from having run > qmail before, where qmail-smtpd always accepted an incoming message > and if spammers don't check for bounces, will always assume a valid > mailbox (one of the main reasons I switched to postfix + qpsmtpd). > > Anyway, this particular configuration also runs postfixadmin, a > virtual mailbox manager based on MySQL. That is only relevant in that > user lookups is somewhat expensive due to SQL query so I would prefer > to minimize that. > > I was using qpsmtpd as a proxy using smtp-forward and I just > discovered that it doesn't actually return the error messages returned > from Postfix, at least in my installation. I always get the following > if sending e-mail to an invalid mailbox: > > 451 Unable to queue message () > > Now, postfix actually returned this: > > 550 <zzz@mydomain.com>: Recipient address rejected: User unknown > in virtual mailbox table > > It looks like smtp-forward doesn't bother to look at the return code > and always return DECLINED, which I will assume is the 451. I am > curious as to why the $! error message never shows up though - is this > an issue with Net::SMTP or ? If I could get to the postfix error > message, maybe I can modify smtp-forward to just pass-through the > Postfix error message (or is that a bad idea?). > > Next, I tried postfix-queue (took me awhile to figure out I needed the > MASK_EXTERNAL flag). Now, the behavior goes back to what qmail does, > which is to allow all recipients and send a bounce later (and then > double bounces - yuck). I am going to leave it at this configuration > for now. > > So the question is, is there a way for me to return 5xx on these > messages at the SMTP level given my configuration? I seems to me that > if I can get smtp-forward to pass-through the returned error codes it > would be ideal, but I am hardly an SMTP guru so your help is much > appreciated. > > Thanks! > > Tim > >Thread Previous | Thread Next