I am testing out a simple workflow to send an email using Email tool but am getting a 'Couldn't connect to server' error.
I've tried multiple combinations of SMTP details & encryption but am getting the same error:
1. Port number in the SMTP field & encryption set to SSL/TLS
2. Port number not in the SMTP field & encryption set to SSL/TLS
3. Port number in the SMTP field & encryption set to STARTTLS
4. Port number not in the SMTP field & encryption set to STARTTLS


I've tried sending an email via TelNet as found in this page, and was able to send an email to myself: https://community.alteryx.com/t5/Alteryx-Designer-Knowledge-Base/Email-SMTP-Troubleshooting/ta-p/32102
My IT confirmed that the port number that we use is 25.
He's asked whether Alteryx has an email server, but given that I am running the workflow off a local machine, I'm not sure if this detail is of importance.
Any suggestions on how I can get this up and running?