It's possible that the file has three adjacent plus signs, causing the modem
to return to command mode, when the file is encoded for transmission in the
email.

The Hayes patent required that the three plus signs be separated from other
information by a pause in transmission (to prevent a random string of plus
signs from dropping the connection), but some vendors, in order to avoid
paying royalties on the patent, implemented the feature by simply dropping
into command mode whenever the data stream contained three plus signs in a
row. 

Many older encoding systems would specifically check for and prevent three
plus signs in a row to make sure this problem did not happen, but I suspect
that younger programmers may not be aware of the issue.

-- 
Eric Hildum



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