Wietse Venema via Postfix-users writes:
 > Don Cohen via Postfix-users:
 > >   $ telnet 96.103.145.163 25
 > >   Trying 96.103.145.163...
 > >   Connected to 96.103.145.163.
 > >   Escape character is '^]'.
 > >   554 resimta-a2p-651038.sys.comcast.net 
 > > resimta-a2p-651038.sys.comcast.net 129.80.158.55
 > >   found on one or more DNSBLs, see 
 > > https://postmaster.comcast.net/smtp-error-codes.php#BL000001
 > 
 > I invite you to look up the documentation for smtp_skip_5xx_greeting at
 > https://www.postfix.org/postconf.5.html#smtp_skip_5xx_greeting

Thank you.  I was nowhere near being able to figure that out for myself.
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