Hi @SK0041, I’m pretty sure you won’t be able to send emails with Gmail anymore. I could be wrong and there might be a way, but Google disabled less secure apps from simply logging in with a username and password last year https://support.google.com/accounts/answer/6010255?hl=en .
If you can’t use sendmail on your server, then you’ll just need to use another non Gmail email account or an email service provider that allows sending emails via smtp.