delayed notifications via email.(Google services)

Just a quick question, has anyone else ran into an issue with your notifications are delayed using Google services? The Test message from the SQL server comes in quickly within a few moment, however when a transitions happens within one of our workflows the notification takes a long time to be sent out or a major delay ( like hours,up to 12 hours). Is there a way to make the SQL server, send out notifications faster?

thanks

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