Make sure that your SMTP server will permit the SMS to relay email, by default most of time relaying will be denied by the SMTP server. From expert mode on the SMS, try this assuming the IP address of your SMTP server is 1.2.3.4 and your email domain is blah.com:
telnet 1.2.3.4 25
EHLO test
MAIL FROM:<sms@blah.com>
RCPT TO:<you@blah.com>
DATA
This is a test email
.
QUIT
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