what is 8bit & base64 encoding?

i got some emails in non-english language encoded from 8bit to base64, when i saw them in plain text file they are all like these:

v8u3Uqq6ILF6pm4sDQoNCrF6pqyo7LNvq8qzb6vKuXGkbLZspfOsT6ZdrLCxeqZiIrRJILZR
IKRzILL4ILBRIL3XILDPIq1xvlykRqVEwQiqtGyvC4uLiIsILNvrdOlRMNEpmKxeqRXprio
.
.
.
.
and more...



such encoded emails are generated by some particular email servers while the remaining (non-english)emails are fine

what the hell is this encoding?

what's the purpose of it?

how to convert them back to human readable text?

thanks

 

 

 

 

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