Error Broadcasting

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Hello,

 

I try broadcasting with gmail account, but i have eror message like this

 

Mailer /Path "E:\MAIL" /Subject "Master Harga" /MailFrom xxxx@gmail.com /Mailhost smtp.gmail.com /Port 465 /EnableSsl True
18/04/2018 10:00:53 AM - The message to the recipient zzzz@gmail.com has not been sent due to the following error: Failure sending mail.
Unable to read data from the transport connection: net_io_connectionclosed.

 

How to resolve this error?thanks

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