Delivery and opt-outs: emails that didn't arrive, and who unsubscribed

Settings → Delivery and opt-outs shows what happened to the emails and texts Seascape sends for you. Look here first when a customer says they never got something.

• Email that didn't arrive lists every email from the last 30 days that did not reach the person it was for: refused before it was sent, rejected by their mail server, or bounced back. Each one says what to do about it, with a button to send it again or a link to where it can be fixed, such as a missing date of birth or a mistyped address. When nothing failed, it says so.
• Email Outbox lists the most recent customer emails sent for your shop, so you can confirm a receipt, confirmation or reminder actually went out, and spot failures.
• Unsubscribed Addresses are addresses that no longer get marketing email from you: review requests and waitlist offers. They still get everything about a booking they hold: confirmations, receipts, refunds, trip and balance reminders, and waiver links. Re-subscribe takes someone off the list. An address marked hard-bounce was rejected as not existing; nobody chose that, and correcting the address is the fix.
• Numbers That Texted STOP: anyone who texts STOP, UNSUBSCRIBE or CANCEL to your number stops getting texts from you, automatically, including the texts your staff send by hand. They can text START to come back. Nobody at your shop can put a number back for them: that is the law, not a setting.

Which emails are sent at all is in Settings → Notifications: see the help article Which emails go out, and changing their wording.