There is no command from server like "LISTING_EXTENSIONS_DONE". SMTPD(8) SMTPD(8) NAME smtpd - Postfix SMTP server SYNOPSIS smtpd [generic Postfix daemon options] sendmail -bs DESCRIPTION The SMTP server accepts network connection requests and performs zero or more SMTP transactions per connection. The replacement SMTP banner text string must always start with 220.
Escape character is '^]'.

As in, "lkkjssjadlk.google.com" must resolve to an IP address or … The issue is that some receiving hosts, particularly those that use Exim, may perform Sender Callout Verification in response to incoming mail delivery attempts. So e.g. SMTP banner is displayed while connecting from external sources. As defined in RFC 2821, the default service ready SMTP response code is 220.
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