What happens if you go over your email contact or send limit?

• Mailchimp Standard: Mailchimp keeps sending and bills add on contact blocks at the peak count for the month, so the block is charged even if the list shrinks again before the bill. The block price is shown only inside the account. Raise the contact limit to the 10,001 to 15,000 band and the monthly price is $230; Mailchimp does not raise it for you. Source.
• Mailchimp Essentials: Same rules as Standard, with a send limit of 10 times the contact limit instead of 12. Source.
• Kit Creator: Kit moves the account to the 15,000 subscriber tier the day the list passes 10,000. On a monthly plan the next bill is $169 plus the prorated difference for the 15 days left, $184 in all. On an annual plan the prorated difference is charged at once. Source.
• Brevo Starter: Brevo does not count contacts on this stop, which allows up to 500,000 stored. It counts emails: 4 campaigns a month to the whole list is 40,000 emails before and 44,000 after, and this month needs 42,000. Adding emails is charged at once, prorated to the next billing date; Brevo prints no formula, so half the $10 step is an approximation. A prepaid pack of 5,000 credits is the other route; its price is not in the help center. Source.
• Brevo Standard: Same send arithmetic on Standard. The stop prices are printed by the Brevo calculator; putting a list on a stop assumes the campaign count, which is why the cells are derived. Source.
• Klaviyo Email: Klaviyo prints a stop at every 500 profiles here, so 11,000 profiles is its own stop. Passing the limit does not stop sending; the plan moves at the next billing cycle unless the count is back under 10,000 at least 24 hours before. The 100,000 send allowance covers four campaigns easily. Source.
• Flodesk Lite: On a monthly plan Flodesk upgrades at the next billing date and does not charge for growth inside the current cycle. The next Lite stop above 10,000 is 15,000. Source.

• ActiveCampaign Starter or Plus: $5 per 1,000 extra sends. Sending would only switch off at 3 times the limit in overage. Source.
• ActiveCampaign Professional: Same rate with a 12 times allowance. Source.
• Constant Contact Lite: $2 per 1,000 extra sends on the 2,501 to 5,000 tier. Counts only campaigns; automated emails are excluded. Source.
• Constant Contact Standard: Same rate with a 12 times allowance. Source.
• Constant Contact Premium: A 24 times allowance covers the month. Source.
• SendGrid Marketing Campaigns Basic 5K: $4 per 1,000 extra emails, added to the next period's invoice. The plan's own limit is 3 times its contact limit, which is why the overage is large. Source.
• Mailchimp Standard: Mailchimp's own example block on Standard is 1,000 contacts carrying 12,000 sends, so one block would cover it if the block at this tier is the same size. Block size and price are shown only inside the account. Source.
• Omnisend Standard: Past the credits, campaigns stop and automations cancel until renewal, unless you confirm an upgrade to Pro, prorated on the days left. Source.
• Brevo Starter: On the 50,000 email stop at $56, adding emails up to the 80,000 stop at $74 is charged at once, prorated to the next billing date, so the charge is at most the $18 step. Remove them afterwards and the lower price returns from the next billing date. Source.
• Klaviyo Email: Flexible overage adds the next tier's sends at the unit rate of your starting plan. Klaviyo states the rule, not a price, and one flex step may not cover 20,000 sends. Source.
• MailerLite Comfort: Comfort upgrades to a tier whose 10 times ceiling covers the sends. The tier stops between 5,000 and 10,000 subscribers were not read, so no dollar figure is given. Source.
• Kit and Flodesk Any paid plan: Neither bills on emails sent. Source.

Prices are compiled from public vendor pages and can lag behind a change. Cells marked Der are calculated from published rules and cells marked Est are rough figures. Neither is an invoice or a quote, so confirm with the vendor before you spend.

• What counts: The contact limit you pick sets the pricing tier, and the tier sets the monthly send limit. Subscribed, unsubscribed and non subscribed contacts all count; archived, cleaned and deleted contacts do not. Test and transactional emails count as sends. Read off About Mailchimp pricing plans on 25 September 2026.
• Past the contact limit: Paid plans: service is not interrupted. Mailchimp charges for one or more add on contact blocks on the monthly bill. Free plan: over 250 contacts, live and test sending is put on hold until you upgrade or cut the list. Read off About Mailchimp pricing plans on 25 September 2026.
• Past the send limit: The same add on contact blocks. Each block carries the plan's send multiple; Mailchimp's own example is a 1,000 contact block on Standard that includes 12,000 sends. Block size and price are shown only inside a logged in account. Read off About additional charges on 25 September 2026.
• How fast it bills: On the monthly bill, based on the peak contact total during the billing period, so deleting contacts later in the month does not lower that bill. Raising the tier removes the additional charges; a temporary spike needs a full cycle at the lower count. Read off About additional charges on 25 September 2026.
• Also stated: Mailchimp does not move the tier for you. The help page tells you to raise the contact limit if the increase is permanent, or to archive inactive contacts and send to smaller segments. Read off About additional charges on 25 September 2026.

Prices at every list size: Mailchimp pricing.

• What counts: Price follows the plan and the highest contact tier reached in the month, even if the count falls again. The send allowance is a multiple of the top of that tier. Read off Knowledge base 5775 on 25 September 2026.
• Past the contact limit: No block. The month bills at the higher contact tier: start at 400, reach 525, fall to 410, and the bill is the 501 to 1,000 tier. Read off Knowledge base 5775 on 25 September 2026.
• Past the send limit: Sending does not stop. Every send over the allowance costs 0.002 dollars. Bounces count as sends. Automated emails such as welcome and abandoned cart emails are excluded; scheduled campaigns and resends to non openers count. Read off Knowledge base 46046 on 25 September 2026.
• How fast it bills: The overage comes out of a prepaid account balance if there is one, otherwise it is a separate invoice charged to the card on file. How soon after the cycle ends is not stated. Read off Knowledge base 46046 on 25 September 2026.
• Also stated: Constant Contact's own example: a 2,500 contact tier at 10 times allows 25,000 sends; sending 40,000 is 15,000 over, a 30 dollar fee. Read off Knowledge base 46046 on 25 September 2026.

Prices at every list size: Constant Contact pricing.

• What counts: A contact limit plus a monthly send limit that is a multiple of it. Accounts created on or after 3 November 2025 count every contact, whatever its list status; older accounts count active contacts only. Read off What happens when I reach my contact limit on 25 September 2026.
• Past the contact limit: Without auto upgrade, email campaigns will not send and automation email steps are skipped until you upgrade. Auto upgrade raises the contact limit when needed, but only if you switch it on. Starter tops out at 25,000 contacts. Read off What happens when I reach my contact limit on 25 September 2026.
• Past the send limit: Sending continues and each send over the limit costs 0.005 dollars. If overage sends reach three times the limit, sending is turned off until next month. The limit covers direct and automated campaigns, not one to one or transactional email. Alerts show at 75, 90 and 100 percent. Read off About email send limits and overage fees on 25 September 2026.
• How fast it bills: Charged as an overage fee for that month. Raising the send limit instead is prorated: monthly plans pay a prorated amount for the month, annual plans for the year. Read off About email send limits and overage fees on 25 September 2026.
• Also stated: Contact auto upgrade is off unless you turn it on in Billing and Upgrade. Read off Does ActiveCampaign automatically increase my contact limit on 25 September 2026.

Prices at every list size: ActiveCampaign pricing.

• What counts: Contacts stored and emails sent. Each paid plan in Twilio's overage table carries a contact limit and an email limit. Read off Marketing Campaigns pricing on 25 September 2026.
• Past the contact limit: A per contact overage at the plan's rate, 0.0023 to 0.0075 dollars. The Free Trial cannot go over its limits, and accounts created through Heroku or Google Cloud get no overages. Read off Marketing Campaigns pricing on 25 September 2026.
• Past the send limit: A per email overage at the same rate as extra contacts, from 0.0023 dollars on Basic 100K to 0.0075 on Advanced 10K. Read off Marketing Campaigns pricing on 25 September 2026.
• How fast it bills: Added to the invoice for the following billing period. Read off Marketing Campaigns pricing on 25 September 2026.
• Also stated: The same pricing page describes the Free Trial as 100 contacts and 100 emails a day for 60 days in one answer, and mentions a free Marketing Campaigns plan with 2,000 contacts and 6,000 emails in another. The overage table is unaffected; the free plan claim is not used on this page. Read off Marketing Campaigns pricing on 25 September 2026.

Prices at every list size: SendGrid Marketing Campaigns pricing.

• What counts: You buy a monthly email volume. The volume you pick sets the price and also caps stored contacts: 500, 1,500 or 500,000 on Starter and Standard. Unused plan emails expire at the end of the month. Read off What are the different quotas applied in Brevo on 25 September 2026.
• Past the contact limit: On the first three Starter and Standard tiers, reaching the contact limit upgrades the plan to the next tier automatically, after warning notices, and the price rises with it. Read off Upgrade to a higher plan on 25 September 2026.
• Past the send limit: A per email overage fee is not stated. To send more you add emails to the plan, or buy prepaid email credits in packs of 5,000 to 1 million, which are used only after the plan's emails run out and never expire. What happens to a send once both run out is not stated. Read off Upgrade to a higher plan on 25 September 2026.
• How fast it bills: Adding emails is charged immediately, prorated from the purchase date to the next billing date, then monthly. Prepaid credits are a one time charge, taken immediately and non refundable. Removing emails applies from the next billing date. Read off Add or remove emails from your plan on 25 September 2026.
• Also stated: Brevo's help center gives two different caps for the third tier: the upgrade article says 2,500 contacts, the quotas article lists only 500, 1,500 and 500,000. Neither affects the examples on this page, which sit on the 500,000 contact tiers. Read off Upgrade to a higher plan on 25 September 2026.

Prices at every list size: Brevo pricing.

• What counts: Billable contacts, which are subscribers plus non subscribers, set the tier. Standard gives email credits of 12 times billable contacts each cycle. Unsubscribed contacts are not billed. Read off Omnisend pricing plans 2026 on 25 September 2026.
• Past the contact limit: The tier moves automatically each billing cycle with the billable count, in both directions, with an email before any upgrade. Importing past the tier prompts an upgrade. Read off Omnisend pricing plans 2026 on 25 September 2026.
• Past the send limit: Standard: campaigns cannot be sent and contacts entering automations are canceled from them until the cycle renews or you upgrade. Free: an upgrade prompt at 500 emails. Omnisend asks you to confirm any upgrade before it happens. Read off Omnisend pricing plans 2026 on 25 September 2026.
• How fast it bills: A tier change applies at the next billing cycle. A mid cycle upgrade is prorated on the days left and restarts the billing cycle. Read off Omnisend pricing plans 2026 on 25 September 2026.
• Also stated: Unsubscribing inactive contacts lowers the tier at the next billing cycle, not immediately. Read off Omnisend pricing plans 2026 on 25 September 2026.

Prices at every list size: Omnisend pricing.

• What counts: Active profiles, meaning every profile the account can email, plus emails sent in the cycle. The Email plan's send allowance is 10 times the profile count at each printed stop. Read off Klaviyo billing help on 25 September 2026.
• Past the contact limit: Paid plans keep sending. The account moves to a plan that covers the profile count at the next billing cycle, unless the count is back under the limit at least 24 hours before. Free plan: no sending until the count is back under the limit. Read off Klaviyo billing help on 25 September 2026.
• Past the send limit: Three choices: flexible overage, a one time add on of the next tier's sends priced at the unit rate of the plan you started the month on; an upgrade, manual or automatic; or no more sending until the next cycle. Read off Klaviyo billing help on 25 September 2026.
• How fast it bills: Profile moves take effect at the next billing cycle. When a flexible overage charge is billed is not stated. Read off Klaviyo billing help on 25 September 2026.
• Also stated: A downgrade has to be made more than 24 hours before the cycle turns over, or it does not take effect. Read off Klaviyo billing help on 25 September 2026.

Prices at every list size: Klaviyo pricing.

• What counts: Active subscribers, counted cumulatively over the billing cycle, so an address that was active at any point counts even if deleted later, plus monthly emails sent. Read off Everything about your subscription plan and billing on 25 September 2026.
• Past the contact limit: Paid plans upgrade to the next tier automatically, with a notice in the account. Free: campaigns, automations and new subscriber imports pause until you upgrade or cut the list below 250. Read off Everything about your subscription plan and billing on 25 September 2026.
• Past the send limit: Paid plans upgrade automatically when monthly sends pass the plan limit. Free: campaigns and automation emails pause until you upgrade or the limit resets the next month. Read off Free plan update FAQ on 25 September 2026.
• How fast it bills: Monthly plans: a prorated amount for the rest of the cycle is worked out at the time of the increase and the new monthly price is charged from the next cycle. Yearly plans: the prorated amount for the rest of the year is charged to the card immediately. Read off Everything about your subscription plan and billing on 25 September 2026.
• Also stated: The terms say overage fees may apply if auto upgrade is switched off or a payment fails, and that the rates will be published on the pricing page. On the pricing page read on 25 September 2026, the rate is not stated. Not Read off Terms of service, section 19 on 25 September 2026.
• Also stated: The pricing page FAQ puts it differently for Comfort sends: reach the limit and you can upgrade to Power or wait for the allowance to refresh. The help article and the terms both describe an automatic upgrade. Read off MailerLite pricing FAQ on 25 September 2026.

Prices at every list size: MailerLite pricing.

• What counts: Confirmed active subscribers only, not emails sent or features used. Read off Billing at Kit on 25 September 2026.
• Past the contact limit: Kit moves the account up to the next subscriber tier automatically so nothing stops working. Moving back down is your call, from billing settings. Read off Billing at Kit on 25 September 2026.
• Past the send limit: No send limit to go over on any plan. Read off Billing at Kit on 25 September 2026.
• How fast it bills: Monthly plans: the new tier's price plus a prorated charge for the rest of the current period, both on the next billing date. Annual plans: the prorated difference is charged immediately. Read off Account upgrade and downgrade FAQs on 25 September 2026.
• Also stated: Importing a large list at once can get the account temporarily suspended; Kit asks to be told in advance. Read off Account upgrade and downgrade FAQs on 25 September 2026.

Prices at every list size: Kit pricing.

• What counts: Active subscribers, counting Active and Soft Bounced contacts only. There are no per email charges on paid plans. Read off Subscriber based pricing and auto upgrade on 25 September 2026.
• Past the contact limit: Flodesk upgrades the plan automatically and emails keep sending. Notices go out at 90, 95 and 100 percent. Lite past 25,000 subscribers moves to Pro. Above 255,000 subscribers, automatic upgrades pause and sales gets in touch. Read off Subscriber based pricing and auto upgrade on 25 September 2026.
• Past the send limit: No send limit to go over on paid plans. Read off Flodesk pricing FAQ on 25 September 2026.
• How fast it bills: Monthly plans: the new tier starts at the next billing date, with no retroactive charge for growth in the current cycle. Annual plans: a prorated adjustment for the rest of the term, applied monthly. Read off Subscriber based pricing and auto upgrade on 25 September 2026.
• Also stated: After an automatic upgrade, a refund is possible if you ask within 30 days and the cleaned list fits the old tier. Read off Subscriber based pricing and auto upgrade on 25 September 2026.

Prices at every list size: Flodesk pricing.

• Which platforms bill for unsubscribed contactsThe counting rules that decide which tier you are on.
• Annual vs monthly email pricingWhat a year up front saves, and what an upgrade does to it.
• Free plan limits comparedWhat each free plan allows before it pauses.
• Klaviyo pricingEvery Email stop and the profile rules.
• Constant Contact pricingLite, Standard and Premium with the send allowance.
• ActiveCampaign pricingStarter, Plus and Professional at every size.
• Email cost calculatorPrice your own list size.
• Change historyEvery recorded pricing event, newest first.