I'm trying to set up Mutt to send email via zoho, and I need some help.

I've added this to my configuration:

set smtp_url = "smtp://$my_user:$ my_pass@smtp.zoho.com"

where my_user is set to username (full email address), and my_pass to (correct) password. When I send the message, I get "Could not connect to smtp.zoho.com (Interrupted system call)".

Does anyone know how to fix this?