Two format string bugs and two buffer overflows exist in Metamail versions 2.2 through 2.7. Patch and test scripts to test for these vulnerabilities are available here.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/32715/metamailBUGS.txt
Source: https://packetstormsecurity.com/files/32715/metamailBUGS.txt.html