Black Friday Email List Prep: A Two-Week Checklist
Start two weeks before Black Friday. Verify every address you have not mailed recently, remove the ones that will bounce, confirm SPF, DKIM, DMARC and one-click unsubscribe are working, and split the list by engagement. Then send smaller campaigns to your best subscribers first, so your reputation is strong when the big volume goes out.
In 2026, Black Friday falls on 27 November and Cyber Monday on 30 November. The plan below counts back from those dates.
Why the list matters more this week than any other
Most stores send more email between Thanksgiving and Cyber Monday than in any other week of the year. So does everyone else. Mailbox providers are filtering enormous volume, and they lean heavily on sender history: how often your mail bounces, how many people mark it as spam, how many open and click.
A list that was fine for a weekly newsletter can go wrong when you suddenly mail every contact you have, including the ones you quietly stopped sending to in spring. That is where the bounces and complaints come from.
Days 14 to 11: find out what is in the list
- Export every segment you plan to mail. Include customers, newsletter subscribers, abandoned-cart contacts and anything you imported this year. The Shopify and Klaviyo export guides show where the files live.
- Remove duplicates and broken syntax. Run the file through the free email list cleaner. It catches duplicates, stray spaces and malformed addresses without sending anything.
- Fix obvious typos.
gmial.comandhotmial.comare common in checkout forms. The email typo corrector suggests the intended domain. - Note how old each contact is. Add a column for the last date each address opened, clicked or bought. You will need it on day 10.
Days 10 to 8: verify and segment
- Verify anything unproven. That means new signups since your last check, imported lists, and anyone you have not successfully mailed in roughly six months. Addresses that opened last week do not need re-checking.
- Remove invalid addresses from every segment you will send to. Keep them in a suppression file so they do not come back on the next import.
- Decide what to do with catch-all and unknown results. These are addresses whose server accepts everything or would not answer. Send to them only from your engaged segment, or hold them back. Our guide to catch-all domains explains the trade-off.
- Split the list by engagement. A simple three-way split works:
| Segment | Who | Holiday plan |
|---|---|---|
| Engaged | Opened or clicked in the last 90 days, or bought this year | Every campaign |
| Lapsing | Last engaged 90 to 180 days ago | Main offers only |
| Dormant | No engagement in 180 days or more | Leave out, or one separate verified re-engagement send |
Days 7 to 5: check the technical basics
- Confirm SPF, DKIM and DMARC. Gmail's sender guidelines require all three for anyone sending more than about 5,000 messages a day to Gmail addresses. Yahoo's best practices say the same. The bulk email authentication checker shows all three records for your sending domain at once.
- Test one-click unsubscribe. Bulk senders must include a
List-Unsubscribeheader with one-click support and process requests within two days. Send a test to a Gmail account and look for the unsubscribe link beside the sender name. - Look at Postmaster Tools. If you have Google Postmaster Tools set up, check the spam rate and domain reputation now, while there is still time to fix them. See our Postmaster Tools guide.
Days 4 to 1: warm up with your best subscribers
- Send an early-access or preview email to the engaged segment only. Good engagement on these sends gives mailbox providers recent, positive data about you.
- Watch bounces and complaints after each send. If either jumps, stop and find out why before the main campaign.
- Freeze the list. Stop importing new sources in the last few days. A fresh, unchecked file added on Thanksgiving night is how a clean list becomes a messy one.
On the day
- Send to engaged first, lapsing a few hours later.
- Keep the dormant segment out of the Black Friday blast.
- Check bounce and complaint numbers after each wave, and pause if they climb.
- Keep unsubscribes flowing back into your suppression list the same day.
After Cyber Monday
Pull the bounce report from every holiday send and remove the hard bounces from all your tools, not just the one that sent. If you sent to catch-all or unknown addresses, compare how they performed against the verified ones. That tells you whether to include them next year.
The checklist
- All send segments exported
- Duplicates, bad syntax and typos fixed
- Unproven addresses verified, invalid ones suppressed
- Catch-all and unknown addresses handled deliberately
- List split into engaged, lapsing and dormant
- SPF, DKIM and DMARC passing
- One-click unsubscribe tested
- Warm-up sends to engaged subscribers done
- List frozen before the main sends
Before you hit send
If part of the list has not been checked this year, verify it now rather than finding out from the bounce report on Black Friday. Sign in with Google and your first 100 email checks are free, no card. For the full list, monthly plans are on the pricing page.
Related: The day-before checklist for a scheduled send and notify-me lists before a restock.
Common questions
When should I start preparing my email list for Black Friday?
About two weeks before. In 2026, Black Friday is 27 November and Cyber Monday is 30 November, so the list work should start around 13 November. That leaves time to verify, fix any authentication problems and send a few warm-up campaigns to engaged subscribers before volume peaks.
Should I verify my whole email list before Black Friday?
Verify every address you plan to mail that has not been checked or successfully mailed recently: new signups from the year, imported customer lists, and anyone you have not emailed in six months or more. Addresses that received and opened your mail last week do not need checking again.
Is it a good idea to email old subscribers on Black Friday?
Not as the first time you have contacted them in a year. Old addresses are the most likely to bounce and the least likely to engage. If you want to reach them, verify them first and send a separate, smaller re-engagement message earlier in November.
What bounce rate is too high for a Black Friday send?
Treat anything above about 2% as a problem. Klaviyo, for example, calls a bounce rate under 1% healthy and over 2% a sign that needs attention. A verified list should sit comfortably below that.
Do I need one-click unsubscribe for holiday campaigns?
If you send more than about 5,000 messages a day to Gmail or Yahoo addresses, yes. Both require marketing mail from bulk senders to carry a one-click unsubscribe header and to honour unsubscribes within two days.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.