OT: Help decoding SPAMMER's encoding of my contact info

[Michael ODonnell]

>> The encoded string is:
>>
>>  MTA2NDIwL21vZEB3b3JsZC5zdGQuY29tLy8
>
>It's base64. The decoded string is:
>
>106420/xxx at world.std.com
>
>HTH!


It does help - thanks!  For the benefit of those here
gathered, please reveal your methods; how did you decode
it?  Is there a simple filter already existing (along the
lines of uudecode) or did you have to write something?