On Tue, 26 Mar 2013 15:24:17 -0700 (PDT) [email protected] wrote: > --- On Tue, 3/26/13, [email protected] <[email protected]>
> > - The easiest way for that is SMTP call-ahead aka > > md_check_against_smtp_server. > A much better way is to access the user database directly. Yes, but that may not be possible for policy reasons. Our spam-filtering service filters mail for a number of clients who (obviously) are willing to open up TCP/25 for us, but are far more reluctant to expose their LDAP directory to us. [...] > Technically within SMTP, the proper way for a secondary to check with > a primary for valid users would not be by faking a mail transaction > but by using the VRFY or EXPN commands (which may be restricted to > only the secondaries to prevent outside abuse). Almost all SMTP servers are configured not to support VRFY or EXPN. Regards, David. _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
