On Fri, 08 May 2009, Charles Marcus wrote: > On 5/7/2009 7:30 PM, Sahil Tandon wrote: > >> relayhost = [post18.emailfiltering.com] > > > Interesting. > > >> May 6 15:22:06 myhost postfix/smtpd[4799]: connect from > >> ixe-mta-18-tx.emailfiltering.com[194.116.198.213] > >> May 6 15:22:06 myhost postfix/smtpd[4799]: NOQUEUE: reject: RCPT from > >> ixe-mta-18-tx.emailfiltering.com[194.116.198.213]: 554 5.7.1 <hlug0901 > >> 0...@buzzhost.co.uk>: Sender address rejected: Access denied; > >> from=<hlug090...@buzzhost.co.uk> to=<cmar...@media-brokers.com> > >> proto=ESMTP helo > >> =<ixe-mta-18.emailfiltering.com> > > > Notice your relayhost (which also acts as the MX for your domain) accepts > > the > > message from the sender and tries to deliver it to your mail store, at which > > point your Postfix installation REJECTs the message. This probably > > generates > > a bounce report (by emailfiltering.com) to the envelope sender. If so, that > > is backscatter. > > Webroots service simply proxies the recipient validation... so normally, > no, this would not be a problem... but, I opened a ticket with them > yesterday morning in case Rik used some kind of malformed message to > trigger a bug in their system...
Yes, their service proxies *recipient* validation, but would it know about your Postfix machine's *sender* policy in order to reject unwanted envelope senders at SMTP time? -- Sahil Tandon <sa...@tandon.net>
