Wedding email lists decay fast: guest emails get mistyped at RSVP collection, change after save-the-dates go out, and an old list can be more than 20% invalid. BounceZero checks every address before you send, so your save-the-dates and RSVPs actually arrive. Verify a list in minutes — free for up to 100 emails.
Your guest list is built months in advance, by many people, from many sources. By the time the save-the-dates go out, a meaningful share of those addresses are already dead.
Guests type their address on a phone, a registry form, or a printed RSVP card - often dropping the @gmail.com suffix. One typo means the save-the-date lands nowhere.
The list was built months ago. Since then guests changed jobs, switched internet providers, or abandoned an old inbox. The address was real once - it isn't now.
Image-heavy wedding emails with "invitation" in the subject line already trip spam filters. A single hard-bounce spike makes it worse and pushes your real emails toward spam.
"A guest list you built a year ago can be more than 20% invalid — the decay is real and silent."
Source: BounceZero Email List Decay Study 2026 — original research on millions of verified addresses
In a single API call whose timing varies by provider and verification path, BounceZero runs each guest email through six layers of validation - so your save-the-dates land, not bounce.
We connect to the recipient's mail server and confirm the exact mailbox exists - not just the domain. Mistyped guest addresses are caught instantly.
Temp-mail and burner domains are flagged in real time, so a guest's throwaway address can't slip into your RSVP list.
Our triple-probe technique resolves catch-all domains that accept everything - a check most verifiers simply give up on.
Addresses like info@, admin@, or the venue's contact@ are rarely a specific guest. Flag them and follow up with the right person.
We confirm the domain actually has functioning mail servers before you waste a save-the-date on it.
Known spam trap patterns are identified and excluded, protecting the sender reputation your wedding emails depend on.
Verify your entire guest list in minutes - no code needed for bulk uploads, with a real-time API if you want to automate RSVP collection.
Create a free account - no credit card required - and copy your API key from the dashboard. You get 100 free verifications every month to test with.
Export your guest or RSVP emails from your wedding website, Google Sheet, or Mailchimp/Klaviyo list. Upload up to 1,000,000 addresses per dashboard job.
Every address is checked for mailbox existence, catch-all, disposable, role, MX, and spam-trap signals - verdicts come back in minutes.
Split your list into valid addresses and flagged ones. Fix the typos, update the changed ones, and drop the dead ones.
Re-upload the clean list to Mailchimp or Klaviyo and send. With invalid addresses removed, your bounce rate stays near zero.
No seats, no platform fees, no annual contracts. Pay only for the verifications you run.
Not sure how much of your list has gone stale? Check the 2026 email list decay study.
New to verification? Start with the complete email verification guide.
Everything couples and wedding planners ask before sending their save-the-dates.
Digital save-the-dates cost roughly $0-50 for the sending service, versus $200-450 for printed cards plus postage and envelopes. Email is cheaper and lets you update guest details right up to the send - but every address has to be valid, which is exactly what BounceZero verifies.
Most couples send save-the-dates 6-9 months before the wedding, and 12 months for destination weddings. Because a list built that early has more time to go stale, verifying it before the first send prevents a wave of hard bounces when it matters most.
Guest emails come from registry signups, RSVP cards, and relatives' address books - collected by many people over many months. People mistype addresses, use work inboxes they later leave, or give a throwaway address. Across our 2026 decay study, an average email list loses roughly 22% of its addresses in a year.
Yes. Export your RSVP or guest-list emails as a CSV and upload it to BounceZero - up to 1,000,000 addresses per dashboard job. Every address runs through the full 6-check pipeline, and you download clean and flagged rows in minutes.
BounceZero maintains up to 99.8% accuracy in internal testing on SMTP-verifiable addresses using a 5-stage pipeline and 65+ signals, including a 3-probe catch-all test that most verifiers skip. The industry benchmark is roughly 95%, so a wedding list checked with BounceZero keeps almost every save-the-date out of the bounce folder.
Yes. Verifying addresses your guests already gave you is a legitimate data-quality step, not new marketing. BounceZero processes lists in EU data centers and never stores or shares the addresses it verifies - results are returned and nothing is added to a database.
Invalid addresses produce hard bounces, which raise your bounce rate with Gmail and Outlook and push future wedding emails toward spam. A 2% hard-bounce rate is generally considered the limit; unverified wedding lists built months in advance frequently exceed it.
No. Every BounceZero account includes 100 free verifications every month - enough to check a small save-the-date list - with full API access and no credit card required.
up to 99.8% accuracy in internal testing on SMTP-verifiable addresses. $3 per 1,000 verifications. Results with timing that varies by provider and verification path. Verify your wedding guest list today - your first 100 verifications every month are free.
No credit card required - 100 free verifications/month - Cancel anytime
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