SMTP SMTP AUTH CRAM-MD5 RFC2195 RFC4954 # # Server-side AUTH CRAM-MD5 REPLY AUTH 334 PDE4OTYuNjk3MTcwOTUyQHBvc3RvZmZpY2UucmVzdG9uLm1jaS5uZXQ+ REPLY dGltIGI5MTNhNjAyYzdlZGE3YTQ5NWI0ZTZlNzMzNGQzODkw 235 Authenticated # # Client-side smtp crypto SMTP CRAM-MD5 authentication mail body smtp://%HOSTIP:%SMTPPORT/905 --mail-rcpt recipient@example.com --mail-from sender@example.com -u tim:tanstaaftanstaaf -T - # # Verify data after the test has been "shot" EHLO 905 AUTH CRAM-MD5 dGltIGI5MTNhNjAyYzdlZGE3YTQ5NWI0ZTZlNzMzNGQzODkw MAIL FROM: RCPT TO: DATA QUIT mail body .