Klasly caps how much any one studio can send or add in an hour, and refuses names and subject lines that contain web addresses. Here is what each message means and what to do.
Member names appear in the emails Klasly sends on your behalf — welcome messages, waiver invitations — so a name containing a link would go out signed by our domain. Real names do not contain links, so we refuse them. Put the address in a note on the member instead.
Adding members one at a time is capped per hour. If you are moving a client list across, use Members → Import instead — it has a much higher ceiling and is built for exactly that.
There is an hourly ceiling on how much mail one studio can send. It sits far above normal use, and it is higher once your studio is past its first month. Wait an hour and the rest will send, or contact support if you have a genuine one-off that needs more.
Subject lines cannot contain a web address (http://, https:// or www.). Put the link in the body of the message instead, where it belongs anyway.