# How to Warm Up Your Email List Before Black Friday Canonical page: https://sunlocke.com/articles/email-warm-up-before-black-friday Page type: article ## Summary Inbox providers distrust sudden jumps in sending volume. Increase it in steps before Black Friday, starting with your most engaged subscribers, and slow down when the warning signs appear. A sender that triples its volume overnight looks, to a filter, like an account that was compromised. Raise volume gradually instead, starting with the people most likely to click. Inbox providers judge each sender against its own recent history, and a sudden spike looks like a warning sign. That is why Black Friday volume is safest when it is built in steps over the weeks before the sale. ## Article details A sender that triples its volume overnight looks, to a filter, like an account that was compromised. Raise volume gradually instead, starting with the people most likely to click. ## Main point Inbox providers judge each sender against its own recent history, and a sudden spike looks like a warning sign. That is why Black Friday volume is safest when it is built in steps over the weeks before the sale. Author: Chris Martinez Section: Strategy Post type: Playbook Story format: standard ## Article content To warm up your email list before Black Friday, raise sending volume in steps over the weeks before November 27. Start with the subscribers most likely to click, and widen the audience only while complaints and bounces stay low. Before the first larger send, fix your domain's authentication settings (SPF, DKIM, and DMARC, explained below), because more volume multiplies every authentication failure. After each step, check your bounce messages and Google Postmaster Tools, Google's free report on how Gmail treats your mail, and slow down when either shows strain. The [holiday email and SMS plan](/articles/holiday-email-and-sms-plan) schedules the first of those steps, a useful message that is not a sale, for the week of November 2. Google's sender guidelines tell senders to start with a low sending volume to engaged users, increase it slowly over time, and avoid sudden volume spikes if there is no history of sending large volumes. Neither Google nor Yahoo publishes a schedule of percentages, so be wary of any article that presents one as a provider rule. ## Which senders need a warmup Not every sender needs a formal warmup. Klaviyo's help center separates two ideas. Warming is the period when a new or long idle sending identity, such as an IP address or domain, earns a reputation as a legitimate sender. Ramping is the gradual increase in volume that supports it, and Klaviyo lists holiday sending among the times to ramp. Three situations call for a plan before Black Friday: * **A new sending domain, new email platform, or new dedicated IP** (a sending address used only by your business rather than shared with your platform's other customers). This is a true warmup. Klaviyo says an email platform or mailbox provider typically takes up to 30 days to make an initial reputation decision. By late October, Black Friday is about four weeks away, so a business in this position has little room to delay. * **A business that sends rarely.** A store that emails once a month has almost no recent history for providers to judge. A burst of daily emails over the holiday weekend will look nothing like that history. * **A business that plans to email many more people than usual.** Adding old customers, imported contacts, or a long dormant segment is a volume jump even if the number of sends stays the same. A business that emails the same engaged list every week from the same domain and platform, and plans roughly the same audience for Black Friday, needs no special program beyond a clean list and steady monitoring. ## Why a sudden jump hurts Providers judge a sender partly against its own history. Google's guidelines warn against sudden spikes from senders with no history of large volumes, and Yahoo's sender FAQ warns that a sender with a sudden spike of activity could get flagged as a compromised sender. Gmail also limits how much mail it accepts from a domain or IP address within a period of time. When mail arrives too fast, Gmail answers with a temporary error that says the mail has been rate limited, and the sending platform has to retry later. On the day of the sale, that retry can push a Black Friday message well past the time it was meant to arrive. More recipients usually means more recipients who have forgotten you, and Gmail and Yahoo both set firm limits on spam complaints. A gradual increase lets you see the complaint rate rise on a small send instead of discovering it on the biggest one. Removing the people most likely to complain comes before the ramp, and [cleaning the email list before Black Friday](/articles/clean-email-list-before-black-friday) gives the limits and the order of work. ## Fix authentication before adding volume Authentication tells a receiving server that mail claiming to come from your domain really does. That proof comes from three records in your domain's DNS settings, usually managed at the company where you bought the domain or the one that hosts your website. SPF lists which services may send email as you. DKIM adds a signature to each message so a receiving server can confirm it came from your domain and was not altered on the way. DMARC tells inboxes what to do with mail that fails those checks. Your email platform gives you the exact records to paste in. Google requires every sender to set up SPF or DKIM. It defines a bulk sender as one that sends close to 5,000 messages or more to personal Gmail accounts within 24 hours. Bulk senders must set up both SPF and DKIM, publish DMARC, and support one click unsubscribe in marketing messages. Yahoo asks bulk senders for both SPF and DKIM, a DMARC policy of at least p=none (a monitor only setting that blocks nothing), and a From domain that aligns with SPF or DKIM. Google's DMARC setup guide adds two details that matter for a holiday timeline: * Turn on SPF and DKIM first. Google warns that mail will probably have delivery problems if DMARC goes live before they are set up, and it tells administrators to allow 48 hours after setting them up before adding DMARC. * Start with a policy of p=none, read the reports, and tighten the policy gradually afterward. Late October is not the time to move to a strict reject policy for the first time. In small businesses, the usual gap is every other tool that sends as the business: the booking system, the store platform's order notices, the invoicing tool, and the help desk. Each one needs to pass SPF or DKIM for your domain, and Google's guide notes that third party senders must be set up as well. Authentication is one part of a longer list of sender rules, and [what inbox providers now require](/articles/what-inbox-providers-now-require-2025) walks through the rest. ## Widen the list by engagement before Black Friday The safest volume to add is volume that earns clicks. Instead of sending to the first 2,000 addresses, then the next 2,000, widen the audience by recency of engagement. * Begin with subscribers who clicked or bought recently and with people who signed up in the last few weeks. * When complaints stay low and bounces stay rare, add people whose last click or purchase is a little older. * Continue widening until you reach the audience you plan to email for Black Friday, and stop there. Subscribers who have not opened or clicked in many months, the group many platforms call a sunset segment, stay out of the ramp. Klaviyo publishes one concrete version of this for its own customers. Its standard guidance starts with people who clicked in the last 30 days or subscribed in the last 15, and keeps the first campaign under 10,000 recipients. After about two weeks on that segment, it widens to 60 days and later 90 days, as long as open rates stay above 20 percent, the measure Klaviyo itself uses. Apple Mail's privacy setting downloads remote content in the background when a message arrives, and Klaviyo says this loads its tracking image and inflates open rates, so read clicks alongside opens. Klaviyo also advises holding win back and sunset flows until ramping and warming are complete. Treat those numbers as one platform's published practice, not as Gmail or Yahoo policy, and check your own platform's documentation if it publishes a different schedule. Google says volume can increase more quickly when a sender emails daily instead of weekly. For a business that usually emails monthly, that is an argument for adding a few smaller, useful sends in early November rather than one large one. A gift guide, holiday hours, or an early access signup gives subscribers a reason to click before the promotions start. Once the ramp reaches full size, those audiences divide into the groups in [Black Friday email segmentation](/articles/black-friday-email-segmentation). ## Monitor with Google Postmaster Tools Postmaster Tools is Google's free reporting for mail sent to personal Gmail addresses. Setup is short. Add the domain you use for DKIM or SPF, then copy the TXT or CNAME verification record that Postmaster Tools gives you into your domain's DNS settings. No data appears until the domain is verified, and data may be missing on days when volume is low, so set it up now rather than in Black Friday week. Four dashboards matter most during a ramp: * **Compliance status**, which shows whether the domain meets Gmail's sender requirements, including authentication, spam rate, and unsubscribe handling for bulk senders. * **Spam rate**, the share of messages delivered to the inbox that recipients then marked as spam. * **Authentication**, the share of mail passing SPF, DKIM, and DMARC. * **Delivery errors**, the share of authenticated messages that were rejected or temporarily failed. Read the data with two limits in mind. It is not real time: Google says the data usually updates within 24 hours, and a fix can take up to seven days to show in the compliance dashboard. Google has also said the separate domain and IP reputation dashboards will be retired, so do not build a holiday monitoring routine around them. For Yahoo, enroll your DKIM domain in its Complaint Feedback Loop to receive reports when a Yahoo user marks your mail as spam. Google tells senders that if messages start bouncing or being deferred, they should reduce volume until the error rate drops, then increase slowly again. A spam rate that rises after a step usually means the newest segment did not want the mail. Return to the previous segment and leave the newer one out of the holiday sends. After the season, the same dashboards anchor the monthly routine in the [email deliverability checklist](/articles/email-deliverability-checklist). ## When to stop adding volume If the spam rate is climbing toward the 0.1 percent ceiling Google asks senders to stay under, or Gmail is deferring mail, Black Friday should go to the audience that is already working rather than a larger one. This guide draws one line of its own: no segment should receive its first message of the season on Black Friday itself. No provider publishes that rule. It follows from Google's warning against sudden spikes, and it has a cost, because any segment not mailed by about mid November sits out the weekend. A business that switched platforms or domains this fall and cannot complete a warmup in time is usually better served by sending its holiday promotions only to recent buyers and recent clickers this year, and building the wider audience in January. Source: Google: Email sender guidelines Google's guidelines for anyone sending to Gmail, the basis for the advice to start small with engaged users, avoid sudden spikes, and cut volume when bounces or deferrals rise. They also cover faster increases with daily sending, one From address per message category, and Gmail's limits on mail per domain and IP address. Reference: https://support.google.com/a/answer/81126 Source: Google: Email sender guidelines FAQ Google's answers to common questions about its sender requirements. It supports the bulk sender definition, the rule that every sender needs SPF or DKIM, and the rule that bulk senders need both, plus DMARC and one click unsubscribe for marketing messages. Reference: https://support.google.com/a/answer/14229414 Source: Google Workspace: Set up DMARC Google's setup guide for DMARC. It says mail will probably have delivery issues if DMARC comes before SPF and DKIM, advises waiting 48 hours after setting them up, recommends starting with a policy of none, and covers mail sent by outside services. Reference: https://knowledge.workspace.google.com/admin/security/set-up-dmarc Source: Google Workspace: Gmail SMTP errors and codes Google's list of the error codes Gmail returns to sending servers. It includes the 421 4.7.28 temporary error saying mail has been rate limited because Gmail detected an unusual rate of email. Reference: https://knowledge.workspace.google.com/admin/support/troubleshooting/gmail-smtp-errors-and-codes Source: Gmail Help: Set up Postmaster Tools Google's instructions for adding and verifying a domain in Postmaster Tools. It says no data appears before verification, the data covers only personal Gmail accounts, and days with low volume may show no data. Reference: https://support.google.com/mail/answer/9981691 Source: Gmail Help: Postmaster Tools dashboards Google's description of each Postmaster Tools dashboard, including compliance status, spam rate, authentication, and delivery errors. It also says data usually updates within 24 hours and a compliance fix can take up to seven days to show. Reference: https://support.google.com/mail/answer/14668346 Source: Gmail Help: Deprecation of the old Postmaster Tools interface Google's notice about replacing the original Postmaster Tools interface. It says the domain and IP reputation dashboards will be retired and that the retirement date has been postponed. Accessed October 21, 2026. Reference: https://support.google.com/mail/answer/16594218 Source: Yahoo Sender Hub: Sender best practices Yahoo's requirements for bulk senders. It supports the need for both SPF and DKIM, a DMARC policy of at least p=none, and a From domain aligned with SPF or DKIM. Reference: https://senders.yahooinc.com/best-practices/ Source: Yahoo Sender Hub: FAQs Yahoo's answers to sender questions. It warns that a sudden spike of activity can get a sender flagged as compromised and explains that its Complaint Feedback Loop requires an enrolled DKIM domain. Reference: https://senders.yahooinc.com/faqs/ Source: Klaviyo Help Center: Understanding ramping vs. warming Klaviyo's own documentation defining warming and ramping, naming holiday sending as a time to ramp, and saying a reputation decision typically takes up to 30 days. It describes one platform's practice, not mailbox provider policy. Reference: https://help.klaviyo.com/hc/en-us/articles/7520811253275 Source: Klaviyo Help Center: How to warm your sending domain Klaviyo's published warming schedule for its customers, the source of the 30 day segment, the 10,000 recipient first send, the 20 percent open rate gate, and the advice to hold win back and sunset flows. Last updated August 6, 2025. Reference: https://help.klaviyo.com/hc/en-us/articles/20413890435355 Source: Klaviyo Help Center: How to identify iOS15 Mail Privacy Protection opens Klaviyo's explanation that Apple Mail Privacy Protection loads images, including its tracking pixel, before anyone reads the message. It supports the warning that open rates are inflated and should be read alongside clicks. Reference: https://help.klaviyo.com/hc/en-us/articles/4416791883163 Source: Apple Support: Mail on Mac, protect email privacy Apple's description of the Protect Mail Activity setting in Mail. It says remote content is privately downloaded in the background when a message is received. Reference: https://support.apple.com/guide/mail/mlhlp1205/mac ## Related services * [Email & SMS Marketing](/email-sms): Follow-up that runs while you work