You can use “Mozilla Thunderbird” for this purpose . It is totally secured, reliable and very good functional email client. It gives you every chance to write with style. Even the search, tags, filters are very good. It has features that enable the user to delete the junk mails quickly. It helps the user to manage Multiple POP and IMAP mails. Here, mail view is free of message tags. Every search can be saved. It offers very good HTML formatting. You can also run it from any removable media like pen drive.
To download, install and configure Mozilla Thunderbird, please watch this video for a tutorial: