> Now to wait for something to trigger one of those double-bounce messages.

Ugh.  Still undeliverable.

Well, I actually GET the email.  Something 'internal' seems to be undeliverable.

Now 'mail for example.com loops back to myself' (not sure what I've done to 
myself NOW. Grumble.)

        Apr 19 16:26:43 mail01 postfix/postscreen[26417]: CONNECT from 
[209.85.161.182]:33241 to [192.0.2.16]:25
        Apr 19 16:26:43 mail01 postfix/dnsblog[26464]: addr 209.85.161.182 
listed by domain dnsbl.sorbs.net as 127.0.0.6
        Apr 19 16:26:44 mail01 postfix/dnsblog[26421]: addr 209.85.161.182 
listed by domain list.dnswl.org as 127.0.5.0
        Apr 19 16:26:49 mail01 postfix/postscreen[26417]: PASS NEW 
[209.85.161.182]:33241
        Apr 19 16:26:49 mail01 postfix/psint/smtpd[26424]: connect from 
mail-yw0-f182.google.com[209.85.161.182]
        Apr 19 16:26:51 mail01 postfix/cleanup[26433]: 3qqLqH35lbz31pW: 
message-id=<3qqlqh35lbz3...@mail01.example.com>
        Apr 19 16:26:51 mail01 postfix/qmgr[24664]: 3qqLqH35lbz31pW: 
from=<dbl-bnc-b-3...@mail01.example.com>, size=257, nrcpt=1 (queue active)
        Apr 19 16:26:51 mail01 postfix/smtp[26465]: 3qqLqH35lbz31pW: 
to=<exampl...@example.com>, relay=none, delay=0.02, delays=0.01/0.01/0.01/0, 
dsn=5.4.6, status=undeliverable (mail for example.com loops back to myself)
        Apr 19 16:26:51 mail01 postfix/qmgr[24664]: 3qqLqH35lbz31pW: removed

I changed the double-bounce, and address-verify sender prefixes

        double_bounce_sender   = dbl-bnc-A-
        address_verify_sender  = dbl-bnc-B-

This^ is obviously from the address verification step.

Am I right in reading that^ as either 'qmgr' or 'smtp (default)' are trying to 
address verify, and failing?

Jason 

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