SQL Server 2017 in Azure Cloud config DB Mail

I have set up a SQL Server 2017 in Azure cloud. I have created a new GMX email address and enabled it for pop3 external programs I have set up db mail on the SQL Server but I am getting the following auth error > The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 1 (2020-01-25T12:14:37). > > Exception Message: Cannot send mails to mail server. (The SMTP server requires a secure connection or the client was not authenticated. The server response was: Authentication required). ) I have tried ports 25 and 587 with/without SSL enabled on server mail.gmx.com. I have checked the network for Azure ports and AllowInternetOutBound is enabled and set to any. Any assistance would be great, thanks in advance