>>> SMTP>> EHLO myhost.test.ex
>>> cmd buf flush 21 bytes
>>> SMTP<< 250-myhost.test.ex Hello the.local.host.name [ip4.ip4.ip4.ip4]
>>> SMTP>> EHLO myhost.test.ex
>>> cmd buf flush 21 bytes
>>> SMTP<< 250-myhost.test.ex Hello the.local.host.name [ip4.ip4.ip4.ip4]