I currently use essential pim pro,which is not just a mail client it is also pim,notes,and whatever you can imagine,and its mail client is really not good(filtering not working properly,no support for newsgroups,no spam filter)but it have some other unbeatable features-one file only for recording data(make it super easy for backuping,plus it have autobackup),encrypted data(set a password so nobody can read your mail and notes),and program with all it's features uses only 11 mb of memory compare to 111 mb of thunderbird.
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