The host option requires your SMTP server host. For example smtp.gmail.com or similar. If this is an external API you are trying to use to send emails, then you need to connect to it using the API Action step in Server Connect.
Thanks Teodor,
I only want to send a limited number of emails for account authentication etc, not for bulk marketing emails at this stage.
Could you recommend a smtp server which has a free option and requires very simple setup, for some reason sendgrid refuses my application and gives no reason, maybe it’s because I don’t have a business website at the moment??