What OS are you switching to? If it’s Windows, then stick with Thunderbird. I have yet to find a better alternative. If you’re switching to Linux, then there’s a whole mess of them to choose from.
I like Evolution and Kmail. Though not as lean as most suggestions in this thread, they are pretty feature-rich and I didn’t find either to be particularly resource hungry.
What OS are you switching to? If it’s Windows, then stick with Thunderbird. I have yet to find a better alternative. If you’re switching to Linux, then there’s a whole mess of them to choose from.
I like Evolution and Kmail. Though not as lean as most suggestions in this thread, they are pretty feature-rich and I didn’t find either to be particularly resource hungry.
Switching to Linux from OSX and it seems between Claws and Thunderbird, I might keep TB and see how it fares on RAM.