[<-] 220 and/or bulk e-mail.
[->] EHLO [user]@[mydomain].com
[<-] 250 HELP
[->] AUTH LOGIN
[<-] 334 [xxxx]
[->] [xxxxxx]
[<-] 334 [xxxxxx]
[<-] 235 Authentication succeeded
[->] MAIL FROM:[user]@[mydomain].com
[<-] 250 OK
[->] RCPT TO:<[user]@[recipient].com>
[<-] 250 Accepted
[->] DATA
[<-] 354 Enter message, ending with "." on a line by itself
[->] Received: by [user]@[mydomain].com (sSMTP sendmail emulation); Mon, 20 Apr 2015 17:00:00 +0100
[->] From: [user]@[mydomain].com
[->] Date: Mon, 20 Apr 2015 17:00:00 +0100