diff --git a/config/action.d/mail-whois-lines.conf b/config/action.d/mail-whois-lines.conf
index 0852ba8f..7ebb8b9f 100644
--- a/config/action.d/mail-whois-lines.conf
+++ b/config/action.d/mail-whois-lines.conf
@@ -21,7 +21,7 @@ norestored = 1
 actionstart = printf %%b "Hi,\n
               The jail <name> has been started successfully.\n
               Regards,\n
-              Fail2Ban" | <mailcmd> -s "[Fail2Ban] <name>: started on `uname -n`" <dest>
+              Fail2Ban" | <mailcmd> "[Fail2Ban] <name>: started on `uname -n`" <dest>
 
 # Option:  actionstop
 # Notes.:  command executed once at the end of Fail2Ban
@@ -30,7 +30,7 @@ actionstart = printf %%b "Hi,\n
 actionstop = printf %%b "Hi,\n
              The jail <name> has been stopped.\n
              Regards,\n
-             Fail2Ban" | <mailcmd> -s "[Fail2Ban] <name>: stopped on `uname -n`" <dest>
+             Fail2Ban" | <mailcmd> "[Fail2Ban] <name>: stopped on `uname -n`" <dest>
 
 # Option:  actioncheck
 # Notes.:  command executed once before each actionban command