Mail Archiver serves as a companion to the user's current email application/client, allowing consolidation, archiving, cleaning, formatting, and permanent storage of emails. Mail Archiver will archive your email in 3 easy steps and you will never lose an email again.

Archiving emails from a variety of email applications into a single database, the app prevents accidental deletions, facilitates quick searches, and eliminates the storage size limits imposed by many email apps and companies. By saving emails in a single, standardized format, users are ensured that they can read all their emails, even those from legacy applications, from which they have subsequently migrated.

Features:

Archive automatically
After you've set up archiving, future archives can be created automatically with the scheduler component. And these are smart archives - taking only what you have not archived before.

Email clients and services
All major email clients are supported: Apple Mail, Outlook, Powermail, Postbox and Thunderbird. Of course, Gmail and Exchange are supported, too.

Flexible export formats
Easily archive your email to Evernote, PDF, Filemaker or the Internal Datebase to suit your needs. From the Internal Database you can export your data to Evernote, PDF or Filemaker.

Protect and speed up
Archive as much of your email as you want, or archive and speed up your email client by removing the mails from the mail client.

Find your mails easily
Search archived email as easily as you search email today.

Automatic verification
Mail Archive X automatically checks and verifies as good whenever mails are added to an archive.

Limitations: Mail Archiver X has a free demo mode which has the same functionality as the paid version. The application in demo mode can be used for 10 calendar days.e.

Requirements:
OS X 10.11+
Intel

Also available are:
Version 4.2.2 for OS 10.11-10.13
Version 4.0.4 for OS X 10.9-10.12