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Every outbound email is checked against your do-not-contact list right before it sends. Names reach it automatically from opt-outs and bounces, or you add them yourself in Settings.
A settings page listing blocked email addresses and domains, each with a source such as added manually or opt-out reply, next to a paste box and an Add to list button.

The do-not-contact list, in Settings.

Add and remove people yourself

1

Open Do not contact in Settings

Paste addresses or domains, one per line or separated by commas.
2

Click Add to list

An entry with no @ sign blocks a whole domain instead of one address.
3

Select rows and click Remove to undo it

That lets Oneprofile email them again. It never happens on its own.

Let names reach the list automatically

An opt-out reply or a click on a sequence’s unsubscribe link adds the address automatically, and stops every sequence it was enrolled in. A hard-bounced address is blocked workspace wide, since a bounce proves the address does not exist. The inbox’s Do not contact action on a thread does the same.

Export the list

Click Export to download the whole list as plain text, one value per line, ready to paste into another tool.

Good to know

No. Removing only lets future emails reach them again. It does not re-enroll them in anything they were stopped from.
Blocking someone from the inbox shows which active sequences it stops before you confirm. The Settings list itself does not show a per-row impact preview.
Yes. Adding a value with no @ sign blocks every address on that domain, not just the one you had in mind.

Next steps

Inbox

Read replies and apply the do-not-contact action from a thread.

Build a sequence

Add an opt-out footer while you build a sequence.