New answers tagged alternative
The alternative option would be no alternative. I'm not aware of a one click option in any other email client. They all require two similar steps to search all emails in all folders, sent to or from a particular email address. For example, in Thunderbird: Right click on an email address and select "Copy Email Address" Right click on the [Search... ...
I don't know if paid software can be recommended, but after testing a lot of free tools, I finally decided to go for Beyond Compare. Meld was my previous choice but abandonned it due to instabilities during merging of very large folders.
I'm a big fan of gmail. It can handle all your pop mails and as you know, google is pretty good with searches. (+you don't loose your email when switching computers)
To find something suitable for you go to this site. I like Geary best: To install it go to a terminal by pressing Ctrl+Alt+T and copy-paste: sudo add-apt-repository ppa:yorba/ppa sudo apt-get update sudo apt-get install geary
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