tests: Added SMTP with credentials test for RFC-821 based server

Added SMTP (RFC-821 only) based test case as a reference for the fix
provided by commit fe260b75.

tests/data/Makefile.am

@@ -78,7 +78,7 @@ test900 test901 test902 test903 test904 test905 test906 test907 test908 \
 test909 test910 test911 test912 test913 test914 test915 test916 test917 \
 test918 test919 test920 test921 test922 test923 test924 test925 test926 \
 test927 test928 test929 test930 test931 test932 test933 test934 test935 \
-test936 test937 test938 \
+test936 test937 test938 test939 \
 \
 test1000 test1001 test1002 test1003 test1004 test1005 test1006 test1007 \
 test1008 test1009 test1010 test1011 test1012 test1013 test1014 test1015 \

tests/data/test939

+<testcase>
+<info>
+<keywords>
+SMTP
+RFC821
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+REPLY EHLO 500 Command unrecognized
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+smtp
+</server>
+ <name>
+RFC821-only SMTP with username and password
+ </name>
+<stdin>
+mail body
+</stdin>
+ <command>
+smtp://%HOSTIP:%SMTPPORT/939 --mail-rcpt recipient@example.com --mail-from sender@example.com -u user:secret -T -
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+EHLO 939
+HELO 939
+MAIL FROM:<sender@example.com>
+RCPT TO:<recipient@example.com>
+DATA
+QUIT
+</protocol>
+<upload>
+mail body
+.
+</upload>
+</verify>
+</testcase>