Download of MailMate 1.13.5671 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The application lies within Communication Tools, more precisely E-mail.
The unique ID for this application's bundle is com.freron.MailMate. The latest version of MailMate can be installed on Mac OS X 10.6 or later. The actual developer of this Mac application is Freron Software. The following versions: 1.8, 1.4 and 1.2 are the most frequently downloaded ones by the program users. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
MailMate is an ambitious, powerful email client for OS X. It is designed for and only supports IMAP while still working in full when offline. MailMate has state-of-the-art searching capabilities and correspondingly advanced smart mailboxes. Extensive keyboard control and dynamic signatures ensure a highly efficient workflow when reading and answering emails.
You may want to check out more software for Mac, such as SpamSieve, which might be similar to MailMate.