I've been a Mozilla Thunderbird user for years and consider it a great piece of software but it has a few shortcomings that are not dealbreakers but annoy me after all this time. One of them is its internal search engine that sometimes ignores parts of the search term (like when I search for keyword.tld and it ignores the .tld part). Another is that it has become pretty slow - it is understandable, considering it has at least a dozen email accounts set up.
I wonder if there are any free or paid alternatives to Thunderbird that could handle a pretty decent traffic (between 50 and 100 emails per day), many email accounts (at least 12) that you could recommend?
Thanks in advance for your replies.