I've recently set up an integration with GoToWebinar. I have set it up so that registration is through a Marketo form and Marketo is used to send invitations and registration confirmation emails.
I was testing the ability to use the resend confirmation email through GTW for instances in which emails are blocked from Marketo (i.e. email address is marked suspended in Marketo).
I discovered that in GTW, if you turn off the feature to automatically send confirmation emails upon registration, it does not allow you to resend the confirmation emails through GTW if the Marketo email is blocked.
The workaround is to turn on the automatic setting, and then resend. However, it would be great if the integration could be set up in a way that allows the resend confirmation email feature in GoToWebinar to override that automatic send setting (which is the case with ReadyTalk, another webinar event partner).