SMTP SASL SASL AUTH CRAM-MD5 RFC2195 RFC4954 # Server-side AUTH CRAM-MD5 REPLY AUTH 334 PDE5NzIuOTg3NjU0MzIxQGN1cmw+ REPLY dXNlciA3MDMxNzI1NTk5ZmRiYjVkNDEyNjg5YWEzMjNlM2UwYg== 235 Authenticated # Client-side smtp crypto digest SMTP CRAM-MD5 authentication mail body smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient@example.com --mail-from sender@example.com -u user:secret -T - # Verify data after the test has been "shot" EHLO %TESTNUMBER AUTH CRAM-MD5 dXNlciA3MDMxNzI1NTk5ZmRiYjVkNDEyNjg5YWEzMjNlM2UwYg== MAIL FROM:%LTsender@example.com%GT RCPT TO:%LTrecipient@example.com%GT DATA QUIT mail body .