Database Email Failure Status at time haevy traffic

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SQL-Server-2012

Hi All,

I am using Database Email Sql server 2012. It's working fine in case less traffic.
But when lot of user use same time, my emails are going in failure and getting Database Email error log, message like -
Error Message -

"Message
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 175 (2015-01-14T17:03:25). Exception Message: Cannot send mails to mail server. (The operation has timed out.)."
)