ttb@ttb-System-Product-Name:~$ mail
"/var/mail/ttb": 12 messages 12 new
>N   1 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N   2 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N   3 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N   4 Mail Delivery Subs Sun Jul 19 18:46  68/2682  Warning: could not send message for past 4 hours
 N   5 Mail Delivery Subs Sun Jul 19 18:46  68/2682  Warning: could not send message for past 4 hours
 N   6 Mail Delivery Subs Sun Jul 19 18:46  68/2702  Warning: could not send message for past 4 hours
 N   7 Mail Delivery Subs Sun Jul 19 18:46  68/2702  Warning: could not send message for past 4 hours
 N   8 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N   9 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N  10 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N  11 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours
 N  12 Mail Delivery Subs Sun Jul 19 18:46  68/2681  Warning: could not send message for past 4 hours