Opt-out from mailing list means can't email at all??

Opt-out from mailing list means can't email at all??

It seems that if a contact unsubscribes from a mailing list the only way to email them is to uncheck the email opt-out box first, then re-check after the email has been sent. I've been through a chat with support and they confirmed this. This seems bizarre. Many of my clients don't want to receive a monthly newsletter but they definitely want to be in email communication with me, often on a daily basis.

Any thoughts out there?