diff --git a/smtp.scm b/smtp.scm
index 7d7fc6b..fe13a72 100644
--- a/smtp.scm
+++ b/smtp.scm
@@ -125,7 +125,7 @@
   (smtp-query (smtp/open host) smtp/vrfy name))
 
 (define (mail-help host . details)
-  (smtp-query (smtp/open host) smtp/help (apply string-append details)))
+  (smtp-query (smtp/open host) smtp/help (apply string-append (cons " " details))))
 
 
 ;;; (smtp-transactions socket ?transaction1 ...)
@@ -140,7 +140,7 @@
 ;;;   + TEXT (list of strings that came with the reply).
 ;;;
 ;;; - If the transaction's reply code is 221 or 421 (meaning the socket has
-;;;   been closed), then the transaction sequence is is aborted, and the
+;;;   been closed), then the transaction sequence is aborted, and the
 ;;;   SMTP-TRANSACTIONS form returns the CODE and TEXT values for the current
 ;;;   transaction.
 ;;;