Mailmeteor Email Verification

Mailmeteor focuses on making Gmail merge sending simple and accessible. It does not function as a standalone email verifier. A pre-send verification pass with BillionVerify gives you a clear quality record for every address in your Google Sheet before the campaign is launched — independent of what the sending tool itself provides.

Yes. Mailmeteor sends through your connected Gmail or Google Workspace account. Bounces and complaints from Mailmeteor campaigns affect the reputation of that account directly. Google treats high bounce rates as a signal that the account is being used for bulk or low-quality sending, which can result in throttling, sending limits, or account suspension.

Yes, and for sheets older than 60 to 90 days you should do this before reuse. Addresses change, companies restructure, and domains expire or change MX configuration. The verification result from a prior campaign does not carry over to future sends. Treat each campaign as a fresh send requiring a current verification pass.

Move them to a separate, lower-volume sheet and send to a small subset first before expanding. A catch-all domain accepts all incoming mail, but that does not guarantee each address routes to a real, active inbox. Mixing catch-all addresses into your main sheet means any bounce from that group directly affects your Gmail account's sending reputation.

Google does not publish a specific threshold, and the tolerance can vary based on sending history and account age. Any sustained pattern of bounces from Mailmeteor campaigns should be treated as a signal to review the list. The safest approach is to prevent bounces before the campaign launches — not to monitor them after and work backward from account restrictions.