GmailX just starts the gmailpopd.py and gmailsmtp.py files in python, which allows to check your mail via POP3 in for example "Mail.app". However, the fact that GmailX is just a 'go between', means that the program itself doesn't affect the results you will get in your mail application. This depends entirely on libgmail and gmailpopd. With the introduction of the SMTP ability in GmailX, it is possible to send mails through your Gmail account from within your mail application.
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