Sorry, I am familiar with the controversy regarding his personality and his argument about the denial of service issues and the claimed security bug that happens if the size allocated to qmail exceeds the number of bytes countable in 32 bits. Yes, he is arrogant, but he does work of the first order.
I stand by my recommendation, and stand by the assertion that secure coding can and has been done in C.
What is lost in this controversy is the sheer magnitude of vulnerabilities in sendmail historically.
wglb