Client Communication
Sparrow
Sparrow SAS(Paid)Emailchemy
Weirdkid(Trial version)Mia for Gmail
Stephane Queraud - Sovapps(Free)Eudora
Eudora(Trial version)Eudora (Penelope)
Eudora(Trial version)Apple Mail Update
Apple(Free)Mail Forward
Sspi-software(Trial version)Mailings
Limit-point(Trial version)GPGMail
GPGMail(Free)Google Notifier for Mac
Google Inc.(Free)