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You may want to block a contact so they never receive campaigns from you (e.g. unsubscribes, invalid addresses, or people who asked to be removed). Unblocking lets you add them back to the pool so they can receive campaigns again. EmaReach has a Manual Block / Unblock area under Contacts for this.
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Fix Gmail connection failures: use App Password and 2-Step Verification; set OAuth Client ID/Secret and redirect URI; check plan limits and app verification.

Use Get Started in the sidebar to follow the step-by-step guide (domains, inboxes, warmup, contacts, templates, campaigns) and the Quick Start Checklist.

In Settings → Notifications turn on Reply notifications (and others you want) so you are notified when contacts respond; notifications use your account email.