Follow official recommendation for domain names in examples.
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index c8c5afe..b635aef 100644
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -4599,9 +4599,9 @@
>>> import smtplib
>>> server = smtplib.SMTP('localhost')
->>> server.sendmail('soothsayer@tmp.org', 'jceasar@tmp.org',
-"""To: jceasar@tmp.org
-From: soothsayer@tmp.org
+>>> server.sendmail('soothsayer@example.org', 'jceasar@example.org',
+"""To: jceasar@example.org
+From: soothsayer@example.org
Beware the Ides of March.
""")