Send e-mail in gmail

Hi,

When trying to send outbound e-mail from my g-mail account I receive the following error message; 550 5.7.1 [209.85.220.41 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit Gmail Help more information. n21-20020a254015000000b00641d2fc4892sor1827052yba.50 - gsmtp

Any idea what to do to avoid this? The e-mail is fully legit and I only attached a 14mb presentation.

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