Mac Apps for E-mail Software

Mailsmith

Free

Email client with filtering, searching, scripting tools.

AutoMailer

Trial version

Merge data from a database with email templates and send to multiple addresses.

eM Client

Free

Manage your emails, calendars, and contacts and sync with Gmail, Outlook.com or any other service.

Tealeaves

Trial version

Access your Infusionsoft data from Apple Mail.

Outlook Email Archive X

Trial version

Archive emails and attachments you have received or sent using Microsoft Outlook.

SubRosaSoft MailGuardian

Paid

redirects emails & blocks spam

ForgetMeNot

Trial version

Remind yourself to include e-mail attachments if you forget.

ENT2TXT

Free

Archive email messages of MS Entourage for OSX.

Inky

Free

Cloud-enabled desktop e-mail app with a fresh interface.

Entourage Address Extractor

Trial version

Export email addresses from Entourage.

Compose Gmail Message

Free

Directs you to Gmail's compose window.

MailMergeApp

Trial version

Merge mail, using Apple Address Book.

eMail Address Extractor

Trial version

Extract valid e-mail addresses from virtually any kind of text file.

Let.ter

Trial version

Markdown-compatible e-mail client just for writing e-mail.

Face2Face

Free

Apple Mail plugin that adds people's faces to their e-mail from Google+, Flickr, or Gravatar.

Aryson Mac MSG Converter

Paid

Convert MSG files into multiple file formats or email clients on the macOS.

Email Verifier

Free

Email Verifier is a web based email verification tool for email address verification online.

Mailplane

Trial version

Bring Gmail to your desktop.

Entourage Browser

Free

Browse and backup Entourage mail messages.

Mail Scripts

Free

Workflow-enhancing AppleScripts for Mail & Address Book.