Break a leg! Below a proof that no start goes always smooth:

> : host route1.mx.cloudflare.net[162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=][162.159.205.11][162.159.205.11=] said: 550 5.1.1
> Address does not exist. 4mZ3ZDn1GNg0 (in reply to RCPT TO command)