I'm looking at adding a newsletter to a couple of forums where there has been high demand from users for a semi-regular mailing. There's an option that members have already opted in to receive site mailings which is perfect. Ideally, I'd use the XF mailer to send out the newsletter as it comes with a one-click unsubscribe link which can disable the "site mailing" option. If I just generated a CSV of e-mails and then used this in Sendy/Mailchimp/etc... then there wouldn't be a one-click unsubscribe that changed this preference in XF, which would mean things get out of sync very quickly. Is there a way around this? I had a look at a couple of the mailing list options on here, but the core XF unsubscribe feature doesn't appear to be integrated on that addons I looked at.