# Senders

> Senders is an email deliverability agency for teams that send a lot of email. We watch sending reputation, plan for volume scale, and step in when things go sideways, covering sales engagement, marketing ESPs, transactional, and mailbox platforms.

## Services

- [How we work](https://senders.co/#how-we-work): Crisis response, redundancy planning, and embedded deliverability support
- [Platforms we support](https://senders.co/#platforms): Sales engagement, marketing ESP, transactional, and mailbox platforms we work with
- [Embedded expertise](https://senders.co/#embedded): A senior deliverability operator embedded in your Slack, Teams, or email

## Tools

- [Email Spam Test Tool](https://senders.co/email-spam-test-tool): Free tool to test whether emails land in the inbox or spam
- [Domain Checker](https://senders.co/domain-checker): Free tool to check domain authentication and sending reputation
- [Deliverability Self-Assessment](https://senders.co/cold-deliverability-assessment): Free self-assessment for cold email senders
- [AI Sequence Builder](https://senders.co/ai-sequence-builder): AI-assisted tool for building cold email sequences

## Resources

- [Blog](https://senders.co/blogs): Guides and articles on email deliverability
- [Case studies](https://senders.co/customers): Stories from teams we've kept in the inbox
- [Deliverability guides](https://senders.co/glossaries): Reference guides on deliverability terms and practices
- [Partnerships](https://senders.co/partnerships): Information on joining the Senders partner program

## Optional

- [Senders.ai](https://senders.ai): Our MCP Connector for AI agents