Postfix Mail Server "/var/spool/postfix/maildrop" Mail Queue Fills /var on Linux Instance
A Linux instance is running the Postfix mail server. The /var/ filesystem on the server has filled to 100% utilization, and further checking subdirectories in /var shows that there are a thousands of files in the /var/spool/postfix/maildrop directory.
# du -sh /var/spool/postfix/maildrop
12G /var/spool/postfix/maildrop
# ls -lrt|tail
-rwxr--r--. 1 root postdrop 40292 Dec 19 15:06 3A71855F715A
-rwxr--r--. 1 root postdrop 40291 Dec 19 15:08 0D44A54C881E
-rwxr--r--. 1 opc postdrop 866 Dec 19 15:10 7ABD855035CA
-rwxr--r--. 1 opc postdrop 871 Dec 19 15:10 6A9705EEF3DC
-rwxr--r--. 1 root postdrop 40292 Dec 19 15:10 54FF354C9718
-rwxr--r--. 1 root postdrop 40292 Dec 19 15:12 26C1E54C8823
-rwxr--r--. 1 root postdrop 772 Dec 19 15:15 972A554C882C