Our website provided a free download of Drain0 1.0 for Mac. Drain0 for Mac is categorized as Communication Tools.
From the developer:
Drain0 is a filter for Eudora Internet Mail Server (EIMS and EIMS X) to manage cleaning of any email containing stray linefeeds (LFs), stray carriage returns (CRs), and NULL bytes.
When the Drain0 filter is first installed and EIMS is first launched, the filter will create a preferences documents (entitled Drain0_Preferences.txt). This preferences document contains default settings for options in the Drain0 filter.
You may want to check out more software for Mac, such as Installer OS X El Capitan, which might be similar to Drain0.