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Looking for advise to replacy Pan newsreader

Pan newsreader,which I used happily for several years, lately get buggy 
as hell and cannot be used any longer at all.

I tried Thunderbird from Debian repo and found that the pure thing is not 
capable to keep a uniform font size through all posts. That is, the font 
size changes as soon as I try to advance either to a next post or to another 

Can your share with me what do you use for newsgroups reading. I do not care 
about binaries. All I want to follow several Linux usenet newsgroups. Plain 
text reading.