我正在调查其他人编写的旧Python代码库。源中有多个from sendMail import sendMail引用。如果我尝试通过运行sudo pip install sendmail来安装模块，则抛出的错误是：
Collecting sendmail
Could not find a version that satisfies the requirement sendmail (from versions: )
No matching distribution found for sendmail
我正在运行Ubuntu 14.04.2 x64和Python 2.7.6。有没有人知道如何安装这种依赖？