Send Email smart service

Hello, I am having an issue with the Send Email smart service, it doesn't work in any process and the resulting alert is this:
"There is a problem with task “Send E-Mail” in the process “sendEmail”. Failed to send email
Problem: An error occurred in executing an Activity Class.
Recommended Action: Examine the activity class to correct the error and then resume."
Our Appian server for training purpose is configured to send mail with a gmail smtp account on port 587.
Could it be on this configuration the problem? Which test can I do?
Thanks in advance


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