A catch-all domain accepts every email sent to it, regardless of whether the mailbox exists. This inflates your list and hides invalid contacts. Detect the signals here.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, even if the specific mailbox doesn't exist. This makes it impossible to verify whether a specific email address is valid.
Sending to catch-all domains carries risk because the email may bounce later. It's best to send a small test batch first, monitor bounce rates, and decide whether to include catch-all domains in your main campaign.
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