求VPS
Operating System:
Fedora 7, 8 (not supporting future versions)
RedHat Enterprise / CentOS 4.x, 5.x, 6.x (64-bit: 4.1 – 4.5, 5.x, 6.x)
FreeBSD 5.x, 6.x, 7, 7 64-bit, 8 64-bit, 9 64-bit (7.3 and 9 may require an exim recompile)
Debian 4.0, 5.0, 6.0. 64-bit: 5.0, 6.0
备注：教程是之前写的，截止到2019.3.14，对应的debian支持到debian9了。FreeBSD也支持到BSD11了。
