Add the following to ~homeuser/.nailrc to set the default SMTP relay:

# Remote SDF SMTP relaying (use SDF 'mkvpm' tool to set auth user:pw):
set ssl-verify="ignore"
set smtp-use-starttls
set smtp=mx.sdf.org:587
set smtp-auth=cram-md5
set smtp-auth-user="sdf_user.sdf.org@sdf.org"
set smtp-auth-password="my_password"''

The SDF CA is self-signed but can still be used if desired. Retrieve and store somewhere (ie. under ~/.openssl/) as pem file, then edit ~homeuser/.nailrc like so:

set ssl-ca-file="/home/home_user/.openssl/sdf_self-signed_ca.pem"
set ssl-verify="warn"  # will issue "self-signed CA" warning
...

Account-specific smtp settings are possible; see the Heirloom Mailx documentation. Postfix MTA using libsaslc(3) on NetBSD 6.x: first, verify that postfix(1) knows about libsaslc :

% sudo postconf -A
saslc
<code>

create (as superuser) the following postfix config files:

**/etc/postfix/main.cf**

<code>
 myhostname = mypc.my.box
  mydomain = my.box
  mynetworks_style = host
  alias_maps = hash:/etc/mail/aliases
  # SMTP client settings: 
  relayhost = [mx.sdf.org]:submission
  smtp_generic_maps = hash:/etc/postfix/generic
  smtp_sasl_auth_enable = yes
  smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
  smtp_sasl_security_options = noplaintext, noanonymous
  smtp_sasl_tls_security_options = noanonymous
  ## explicitly allow/prohibit certain SSL protocols:
  #smtp_tls_mandatory_protocols = !SSLv2, !SSLv3, TLSv1
  ## use of "may" option allows fallback to cleartext
  #smtp_tls_security_level = may
  smtp_tls_security_level = encrypt
  smtp_sasl_type = saslc

/etc/postfix/generic

  # applies to msgs to be delivered off-site
  me@mypc.my.box  sdf_login@sdf.org

/etc/postfix/sasl_passwd

(for security set ownership to root:wheel, permissions to 600)

  [mx.sdf.org]:submission  sdf_login.sdf.org:smtp_passwdrd

hash /etc/postfix/{generic,sasl_passwd}, then check and reload configs:

% cd /etc/postfix/
% sudo postmap generic sasl_passwd  # creates generic.db & sasl_passwd.db
% sudo postfix check                # no output unless errors
% sudo /etc/rc.d/postfix reload

test to verify everything is working correctly:

% mailx sdf_login@sdf.org
  Subject: test
  123
  .
  EOT


% sudo tail -n10 /var/log/maillog | grep smtp        
<nowiki>  Apr 27 08:53:42 mypc postfix/smtp[13387]: A61631F1FDC: to=<sdf_login@sdf.org>, \ </nowiki>
  relay=mx.sdf.org[192.94.73.24]:587, delay=3.9, delays=0.02/0/3.7/0.11, dsn=2.0.0, status=sent \
  (250 2.0.0 s3RFrfvZ010436 Message accepted for delivery)

You should now be set up to use SDF's SMTP server. Enjoy!