A problem with emails containing special characters

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If i configure any Gmail account in outlook express (POP), i can't send
using it to email addresses containing underscore "_" or dot ".", i
receive a delivery status notification (failure) :"PERM_FAILURE: Parse
Error: Illegal To: address (invalid domain name)", but it works if i
use microsoft outlook.
Did any experience something like this? and does anybody know what the
problem might be?

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