| 24metrics 24metrics.com | Cybersecurity | Email delivery (transactional & notifications) | USA/EU |
| 3B Digital 3bweb.com | Marketing | Email infrastructure | Global |
| 3motionAI 3motionai.com | HealthTech | Secure transactional email delivery with SPF, DKIM, and DMARC protections | United States |
| AllClients allclients.com | CRM Solutions | Email Services | USA |
| Appcues appcues.com | Customer Engagement Platform | Used for delivering emails as part of the Appcues out-of-product messaging product. | USA & EU |
| Ariso ariso.ai | AI/ML, Productivity | Email delivery | N/A |
| Bigtime bigtime.net | Professional Services Automation | Mailing service | United States |
| Black Box Intelligence blackboxintelligence.com | FoodTech | Email Dispatch | Germany / USA |
| BoldSign boldsign.com | E-signature | Sending transactional emails on behalf of the SaaS provider | United States,Germany |
| Botdoc botdoc.io | Cybersecurity | Service used to send emails to users. | United States |
| Bright brightsg.com | HR Tech | Email delivery service | Germany / Belgium |
| BrowserStack browserstack.com | DevOps | Email Service | USA |
| Buttondown buttondown.com | Email Marketing | Email delivery and transactional email services | United States |
| Checkhub checkhub.io | Automation, Document Management | Email delivery | EU |
| Checkr checkr.com | HR Tech | Customer Communication | United States |
| Choozr choozr.ai | Retail Tech | An email service for sending transactional emails such as invoices, registration links, and password reset emails. | United States |
| Clearbit clearbit.com | Analytics | Mailgun is a transactional email service to send, receive and track email communications. | United States |
| Cleo hicleo.com | HealthTech | Messaging | United States |
| Convictional convictional.com | Productivity | Mail Sending | USA |
| Crusoe crusoe.ai | Cloud Infrastructure, AI/ML, Energy | Transactional email | United States |
| Customer.io customer.io | Marketing | Customer Communications | USA, EU |
| Dataedo dataedo.com | Data Governance | Email delivery service | USA |
| Delib Knowledge Base delib.net | Civic Tech | Transactional email | Germany |
| Docsumo docsumo.com | AI Document Automation | Transactional email delivery | USA |
| Doodle doodle.com | Productivity | Email Delivery | USA |
| Duome duome.co | Workplace Management / Hybrid Work Solutions | Email delivery & reporting service | Not specified |
| EarlyDog earlydog.com | Cloud Infrastructure | Customer Communication | Various Locations |
| Elementor elementor.com | Web Development | Customer engagement platform | USA |
| e.Republic erepublic.com | Public Sector Innovation | Email Automation | United States |
| Eventify eventify.io | Event Management | Cloud Based Email Notification Service | Europe/USA |
| Favro favro.com | Productivity | Email2Card service | US |
| Fly.io fly.io | Cloud Infrastructure | Transactional email | United States |
| Fortrabbit fortrabbit.com | Cloud Infrastructure | Email service for status updates | USA |
| Genetec genetec.com | Cybersecurity | email service provider, provides scalable API (Application Programming Interface) used to send email notifications | United States |
| GitProtect.io gitprotect.io | DevOps | Email delivery service | US |
| Gleam gleam.io | Marketing | Email delivery and tracking service | USA |
| Glide glideapps.com | Cloud Infrastructure | Email delivery service. | Unknown |
| Greenhouse greenhouse.com | HR Tech | Subprocessor for Greenhouse Recruiting Only; Email Services | United States |
| Gumloop gumloop.com | AI/ML | Email service provider | United States |
| HiHello hihello.com | Productivity | Email Service Provider | United States |
| HiPeople Data Partners hipeople.io | HR Tech | Transactional email and email validation | EU |
| Humbear Media humbearmedia.com | HealthTech | Transactional email delivery | USA |
| Humi humi.ca | HR Tech | Marketing | USA |
| Hyvor hyvor.com | — | Email | United States |
| InfluxData influxdata.com | Database, Data Analytics | Service notifications | US |
| Instatus instatus.com | DevOps | Email messaging service | United States |
| Ironclad ironcladapp.com | AI Contract Lifecycle Management | Email Notifications | USA |
| Ironclad ironcladapp.com | AI Contract Lifecycle Management | Email Notifications | EU |
| Iterable iterable.com | Marketing | Send and receive emails via API. | United States, Belgium |
| Kalingo kalingo.hu | Marketing | Email delivery | USA |
| Kestral kestral.team | AI/ML | Email delivery services | United States |
| Konveio konveio.com | GovTech | Email service | United States |
| Lattice lattice.com | HR Tech | Email | United States |
| Learning Pool learningpool.com | EdTech | Transactional email delivery API | USA |
| Learning Technologies Group ltgplc.com | EdTech | Email communication | Germany & Belgium (for EU), USA |
| Learning Technologies Group ltgplc.com | EdTech | Email communication | Germany & Belgium (for EU), USA |
| Learningwithparents learningwithparents.com | EdTech | Automated and mass emails. | — |
| Leena AI leena.ai | AI/ML | Sending emails to the users | USA, can be localized in select locations |
| Leexi leexi.ai | AI/ML, Productivity | Email Delivery Service | EU |
| Lingohub lingohub.com | Localization/Translation Management | Email services | EU |
| Loadsmart loadsmart.com | Logistics/Transportation Technology | Email platform | United States |
| Logtivity logtivity.io | Web Monitoring | Transactional email service. | USA |
| Masterpiece Studio masterpiecestudio.com | 3D Modeling and Animation | service email sender | USA |
| Matters.Cloud matters.cloud | Legal Tech | Email Automation | Europe |
| Maxio maxio.com | Fintech | Message Delivery | San Antonio, TX |
| Mercell mercell.com | E-procurement | Email deliverability platform | Germany, Belgium, Bulgaria, France |
| Mixmax mixmax.com | Sales Technology | Email Messaging | USA |
| Molecule Software molecule.io | Energy Trading and Risk Management (ETRM) | E-Mail Notifications | USA |
| Mynoteable mynoteable.com | HealthTech | Automated email delivery | United States |
| Nango nango.dev | API Integration | Transactional emails | USA |
| Notabene notabene.id | Cybersecurity | Email notifications | Unknown |
| Nylas nylas.com | API Integration / Communication Services | Communications | United States |
| Octopus octopus.do | Website Planning Software | Transactional and marketing emails | USA |
| Onboard.io onboard.io | Productivity | Email sending | USA |
| Onit onit.com | Legal Tech | Email Automation Service | United States |
| Ory ory.sh | Identity and Access Management (IAM) | Mail Service | europe-west1, europe-west3 |
| Participant Kit consentkit.com | HR Tech | Email provider - Bulk emails sent to participants | EU |
| Penny AI Technologies Inc. getpenny.com | Sales Enablement | User email communication system | Germany, Belgium |
| Phantombuster phantombuster.com | Sales Automation | Mailing tool | United States |
| Pinpayments pinpayments.com | Fintech | Transactional email | USA |
| Planning Center planning.center | Church Management Software | Email Delivery | USA |
| Plivo plivo.com | AI/ML | Email Delivery Service for Businesses | USA |
| Postscript postscript.io | Marketing | IT infrastructure | United States of America |
| Pressable pressable.com | Cloud Infrastructure | Email delivery | United States |
| Provet provet.cloud | HealthTech | Incoming email messaging | USA |
| Quantic Help Docs quantic.edu | EdTech | Email forwarding | USA |
| Rally UXR rallyuxr.com | Research Operations | Email Service Provider | US |
| Relevance AI relevanceai.com | AI/ML | Outbound email services | US |
| Revizto revizto.com | AECO Collaboration Software | Email delivery | EU/US |
| Rewst rewst.io | Automation, DevOps | Email delivery services. | United States |
| Robin robin.education | EdTech | Email sending infrastructure | EU |
| Schedule it Ltd scheduleit.com | Productivity | Email Service Provider - Managed mail servers are provided by Mailgun. Emails that are triggered programmatically from the applications are sent via Mailgun. | United States |
| Scoro scoro.com | Professional Services Automation | Email service provider | United States and EU |
| Send send.ai | AI/ML, Document Processing | Email sending and receiving | Europe |
| ShipBob shipbob.com | E-commerce Fulfillment | Transactional Email | US |
| SimpleLegal simplelegal.com | Legal Tech | Email Automation Service | United States |
| SmartRecruiters smartrecruiters.com | HR Tech | Mailgun powers the email functionality between candidates and customers. | San Antonio, TX, USA |
| Sopheon sopheon.com | — | Email notifications | United States |
| Stack Moxie stackmoxie.com | Marketing, RevOps | Send email notifications to customers | United States |
| Stacksi stacksi.com | Cybersecurity | Email Delivery | United States |
| StandupBot standupbot.com | Productivity | Transactional email service | United States |
| SugarCRM UK sugarcrm.com | Sales Automation | Email delivery services | USA |
| Superside superside.com | Creative Services, AI-Powered Design | Transactional email delivery to customers | US |
| SupportBee Docs supportbee.com | Customer Support Software | Email delivery service | USA |
| Surveypal surveypal.com | Customer Experience Management (CXM) | Mail sending provider for survey invitations processing e-mail addresses, and other information customer chooses to use for sending email | US |
| Syncmatters syncmatters.com | CRM Integration | Email parsing and related services. | United States |
| Tability tability.io | Productivity | Transaction emails | Unknown |
| Teamable teamable.com | HR Tech | Customer Management and Support | USA |
| Teleport goteleport.com | Cybersecurity | Email Automation and Delivery | United States |
| Telerivet telerivet.com | — | Telerivet may use Mailgun as a backup provider for sending transactional emails to Telerivet users, as an alternative to SendGrid. | US |
| The Conover Company conovercompany.com | EdTech | Email delivery service | USA |
| The Leap theleap.co | E-commerce | Email delivery service to send transactional emails to The Leap users | United States |
| Thinkific thinkific.com | EdTech | Used by the Thinkific platform to provide email services | United States |
| TimeCamp timecamp.com | Productivity | email server | USA |
| Tracecat tracecat.com | Cybersecurity | Email delivery services | United States |
| Typefully typefully.com | Social Media Management, AI Tools | Transactional email delivery. | USA |
| Userback userback.io | Product Management, User Feedback Tools, SaaS | Transactional email | United States |
| Wellfound wellfound.ai | HR Tech | Marketing | One Alliance Center, 3500 Lenox Road NE Suite #1875, Atlanta, GA 30326, United States |
| Wellspring wellspring.com | Innovation Management, Intellectual Property Management | Email notifications | United States |
| Whova whova.com | Event Management Software | Email communication system | USA |
| Wordwall wordwall.net | EdTech | Service & marketing emails | USA, EU |
| Xopero xopero.com | Cybersecurity | Email delivery service | US |
| Xref xref.com | HR Tech | Transactional mail services provider | United States |
| Zapier zapier.com | Automation, AI, Productivity | Email sending capabilities per customer queries | USA |
| Zenbase AI zenbase.ai | EdTech | Email sending service | USA |