Unverified50% confidenceFactExact time
Catch-all mail servers return "recipient exists" for all addresses, so an affirmative answer obtained from them has no verification value.
1
Sources
50%
Confidence
Long-term
Relevance
10/28/2026
First Seen
Sources
Email Verification in Claude and Cursor: An Email Verification MCP in Practice
youtubeVerifox10/28/2026
Related Entities
Related Claims
UnverifiedCatch-all addresses cannot be further determined as to whether a specific address exists, and there is still a risk of bounce-backs during actual sending, which is an industry-wide challenge74% similarUnverifiedIdentifying catch-all mailboxes usually requires sending probe requests to random addresses under the same domain; if the random address is also accepted, it is determined to be catch-all.73% similarUnverifiedMany enterprises configure noreply addresses as real but unmonitored mailboxes, causing emails replied to by users to be successfully delivered and stored.70% similarUnverifiedSending an email is not itself an idempotent operation; only after the email service provider accepts the request and returns a message ID can the email be confirmed as sent.70% similarUnverified通过自有域名+Cloudflare Catch-All方案创建的邮箱地址不会被平台识别为临时邮箱68% similar
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