Challenge
You need to configure email notifications to be sent to a Gmail or Google Apps Mail account.Cause
Use of port 587 is required for TLS when communicating with Gmail or Google Apps Mail.Solution
Set the Port to 587 in Veeam Backup and Replication console > Menu > Options > Email Settings > Advanced.More Information
More information is available in this Google KB.In some rare cases the ‘Access for less secure apps’ may need to be Turned On. For details, check this KB article.