Important fix mentioned by The Dragon De Monsyne: the sendmail()
method does _not_ disconnect the connection when it throws a
SMTPHeloError!
diff --git a/Doc/lib/libsmtplib.tex b/Doc/lib/libsmtplib.tex
index 2699cc7..d7f0147 100644
--- a/Doc/lib/libsmtplib.tex
+++ b/Doc/lib/libsmtplib.tex
@@ -144,8 +144,7 @@
 \item \exception{SMTPHeloError}
 
 The server didn't reply properly to
-the helo greeting.  The connection has
-been closed.
+the helo greeting.
 
 \item \exception{SMTPSenderRefused}