Mutt /tmp full error when "trying" to read email

[Bryan Cassidy]

Here is a little about my setup

uname -a
FreeBSD mail.comcast.net 7.2-RELEASE FreeBSD 7.2-RELEASE #0: Fri May  1 08:49:13 UTC 2009     root at walker.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

Mutt 1.4.2.3i 

Output from df -h

Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad0s1a    496M    143M    313M    31%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/ad0s1e    496M    332M    124M    73%    /tmp
/dev/ad0s1f     30G    2.9G     25G    11%    /usr
/dev/ad0s1d    1.9G     53M    1.7G     3%    /var
linprocfs      4.0K    4.0K      0B   100%    /usr/compat/linux/proc

When /tmp shows 73% used why am I getting these messages when trying 
to open emails in mutt? I cannot opem them at all. Thanks in advance.