It's silly to keep replying to myself, but here goes. I notice in
smtp-forward this loop:
for ($transaction->recipients) {
$smtp->to($_->address) or return (DECLINED, "To: Unable to queue
message ($!)");
}
this seems to suggest that if any one recipient fails, the whole
transaction fails. That seems to be contrary to my experiences with
mail servers. Would it be better for me to count the number of valid
recipients and DECLINED or DENY only if there are no valid recipients at
all?
Thanks,
Tim
On 09/09/2007 1:00 PM, Tim Tsai wrote:
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 <[EMAIL PROTECTED]>: 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
