Uptime SLA with a figure in Email marketing
"High availability" is marketing. "99.9 %" is a commitment.
Read the percentage with its scope: use the uptime calculator for a time-based example and the SLA review checklist for the questions behind it.
2 of 33 companies we measured here publish it, that is 6%. Last checked 2026-10-16.
6% here against 3% across every category we measure. Email marketing sits above the overall share for this criterion.
This page counts companies, not product entries: a company with two products in this category is one company here and two rows below.
Back to Uptime SLA with a figure across all categories, or to Email marketing.
- Found2
- Not found at checked addresses31
- Not measured4
37 companies in total. Unmeasured companies are excluded from the published share.
Published
An availability commitment with a figure.
| Vendor | What we found |
|---|---|
| ActiveCampaign | https://www.activecampaign.com/legal/service-level-agreementChecked |
| Mailgun | https://www.mailgun.com/legal/sla/Checked |
No uptime figure found.
We reached at least one address for each of these vendors and none of them carried it. That is what we found at the addresses we checked, on the date we checked them, and not a statement about what the vendor has.
| Vendor | What we found |
|---|---|
| AWeber | 6 addresses checkedChecked |
| Benchmark Email | 6 addresses checkedChecked |
| Brevo | 6 addresses checkedChecked |
| Brick Street CONNECT | 6 addresses checkedChecked |
| Buttondown | 6 addresses checkedChecked |
| Campaign Monitor | 6 addresses checkedChecked |
| CleverReach | 6 addresses checkedChecked |
| Cloudy | 6 addresses checkedChecked |
| Customer.io | 6 addresses checkedChecked |
| Elastic Email | 6 addresses checkedChecked |
| Emailable | 6 addresses checkedChecked |
| Emailchef | 6 addresses checkedChecked |
| EmailOctopus | 6 addresses checkedChecked |
| Flodesk | 6 addresses checkedChecked |
| inwise | 6 addresses checkedChecked |
| Inxmail | 6 addresses checkedChecked |
| Kit | 6 addresses checkedChecked |
| Klaviyo | 6 addresses checkedChecked |
| MailBluster | 6 addresses checkedChecked |
| Mailchimp | 6 addresses checkedChecked |
| Mailcoach | 6 addresses checkedChecked |
| Mailmodo | 6 addresses checkedChecked |
| MailPoet | 6 addresses checkedChecked |
| Omnisend | 6 addresses checkedChecked |
| Pinpointe | 6 addresses checkedChecked |
| Postmark | 6 addresses checkedChecked |
| Rapidmail | 6 addresses checkedChecked |
| Sender | 6 addresses checkedChecked |
| SendFox | 6 addresses checkedChecked |
| Substack | 6 addresses checkedChecked |
| Warmbox | 6 addresses checkedChecked |
Not measured
We could not look at these, or their robots.txt asks us not to. That says something about our measurement, not about them, and they are left out of the percentage above.
| Vendor | What we found |
|---|---|
| Constant Contact | The vendor’s robots.txt excludes us from at least one of these addresses, so this was not measured.Checked |
| MailerLite | The vendor’s server blocked or rate-limited our crawler, so this was not measured.Checked |
| Mailjet | This vendor was not measured because our run stopped waiting for it.Checked |
| Moosend | This vendor was not measured because our run stopped waiting for it.Checked |
Other criteria in Email marketing
- Data processing agreement
- Subprocessor list
- Data location stated
- Status page with history
- Public pricing
- Certifications named
- HTTPS enforced with HSTS
- No third-party tracking before consent
- security.txt (RFC 9116)
- Notice before subprocessors change
- Named privacy contact
Uptime SLA with a figure in related categories
Found something we missed? Tell us. A correction moves that vendor into our next nightly run. That run reads the same fixed addresses we check for every vendor, not the address you send.