I’m no expert for email configuration. All I have is google search. From the Sendgrid docs:
[quote]Change your SMTP username and password to your SendGrid credentials
Set the server host name to smtp.sendgrid.net
Use ports 25 or 587 for plain/TLS connections and port 465 for SSL connections[/quote]
So I’d say that you should change port from 465 to 587 to use TLS.