Earlier, I wrote: > I'm starting to ponder the idea of setting up a separate service in > my master.cf file -- similar to the standard "smtp" service, but with > a few parameters overridden -- and define that separate service as > my smtp_fallback_relay, and have the separate service use my *real* > fallback relay as its relay host, and enable sender-dependent > authentication in the separate service instead of in my standard > SMTP service. But I realize that would be a messy kludge, and I'd > prefer not to do it this way except as a last resort.
That idea doesn't appear to work -- the separate SMTP service considered the mail passed to it by the main Postfix instance to be unauthenticated (because it wasn't coming directly from my user agent?) and insisted it wouldn't act as an open relay. I tried the option smtpd_recipient_restrictions= in the separate SMTP service, but that didn't work -- Postfix demands that this parameter must contain at least one working instance of reject_unauth_destination, reject, defer, or defer_if_permit -- i.e., it looks like it simply will not allow itself to be configured as an open relay, period, even if I'm sure I know what I'm doing. And there doesn't seem to be any way for me to use my web hosting service (Bluehost) as my fallback without doing sender-dependent authentication; their tech support's suggestion that I try using my master domain account cPanel login info as a site-wide, sender-independent authentication did not work. So I appear to be stuck -- I can't avoid the situation (as I described in my e-mail from last night; see details there) where a random destination MX is deciding to ask me for authentication, and it understandably doesn't like my sender-dependent authentication info intended only for my fallback relay, and I can't selectively give out or withhold my authentication info because sender-dependent authentication cares *only* about the sender and apparently can't be told to care about the identity of the destination host. Any suggestions would be welcome. Rich Wales ri...@richw.org
