To ask the obvious question, does the total size of the attachments exceed the 25MB limit that Google GMail enforces? Considering that one line repeated twice in your posted logs reads:
Code:
send: 'mail FROM:<mykeynoteselim@gmail.com> size=85050605\r\n'
your log files suggests that you are attempting to send an 81.11MB (85,050,605 byte) file which is well over 25MB (26,214,400 bytes).