Suppressions
The list of people you must not email.
Mostly it maintains itself. The part worth knowing is which suppressions you can undo and which you cannot.
Four layers
- Automatic
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A permanent bounce means the address does not exist. A complaint means somebody pressed "report spam". Both stop sending immediately, with no action from you.
- Soft bounces
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A full mailbox or a bad afternoon does not suppress on its own. Repeated ones eventually do.
- Yours
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Addresses or whole domains you never want mailed: a competitor, somebody who asked by phone, a role account.
- Known-bad addresses
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Spam traps and addresses with a history of harming deliverability are filtered before a send, so a bought or scraped list cannot quietly wreck your reputation.
A complaint cannot be undone from an API.
Somebody said your mail was spam. That is the clearest statement a recipient can make, and a suppression you can lift with a script is not a suppression. Hard bounces can be removed, though reviving a dead address is a fast route into a spam trap.
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