>>> SMTP<< 220 server ready
>>> 127.0.0.1 in hosts_avoid_esmtp? no (option unset)
>>> SMTP>> EHLO myhost.test.ex
+>>> cmd buf flush 21 bytes
>>> SMTP<< 250 OK
>>> 127.0.0.1 in hosts_require_auth? no (option unset)
>>> SMTP>> MAIL FROM:<CALLER@myhost.test.ex>
+>>> cmd buf flush 37 bytes
>>> SMTP<< 250 OK
>>> SMTP>> RCPT TO:<verify@domain.com>
+>>> cmd buf flush 29 bytes
>>> SMTP<< 250 OK
>>> holding verify callout open for cutthrough delivery
>>> ----------- end verify ------------