Catch-all domains
When a domain is configured as catch-all, its mail server accepts every recipient during the SMTP conversation and decides later what to do with the message. A mailbox probe therefore says yes to every address, including ones that do not exist. The honest result is that existence cannot be confirmed.
Role accounts
Addresses like info@, sales@, support@, admin@ and postmaster@ usually route to a team. They are real and often deliver, but they are shared, which changes how people respond and how complaints happen.
How to treat them
| Type | Suggested handling |
|---|---|
| Catch-all | Keep for transactional or high-intent contact; segment from bulk campaigns. |
| Role account | Fine for company-to-company outreach you chose deliberately; avoid for consumer marketing lists. |
Questions
Is a catch-all address invalid?
No. It may deliver, but the mailbox cannot be confirmed, so it is classified as uncertain or risky rather than invalid.
Should I remove role accounts from my list?
Not always. Segment them and decide based on how you collected them and what you plan to send.