Compress but not enough space

I want to compress the e-mail as recommended by Thunderbird, but it continues to give me the message that my drive is too full the compress for my mailbox “all e-mail”. Does anyone has the solution to get this fixed?

Hi LotRtb. This is not a support venue. Please post your issue at

Note, Thunderbird does not have a “compress”. Please use the term “compact”.

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