Subprocessors
Last updated 1 August 2026
These are the third parties that may process data on our behalf when you use MastroSDR. This page is referenced by our Data Processing Addendum.
| Provider | Purpose | Data involved |
|---|---|---|
| Application hosting | Runs the MastroSDR application and database | All application data |
| Stripe | Payments and subscription management | Billing contact and payment metadata. Card numbers go directly to Stripe and never reach us. |
| Resend | Delivers MastroSDR's own account email: password resets and address confirmation. Separate from the delivery provider you connect for outreach. | Your account email address and the contents of those messages |
Providers you choose
For sending, and for AI once you connect a key, you decide which of these companies processes your data and you contract with them directly.
| Provider | Purpose | Data involved |
|---|---|---|
| Your AI provider | Generates email drafts on request | Your pitch text and the prospect details for the email being written |
| Your email provider | Delivers the emails you send | Recipient address, subject and body |
If you connect no email provider, MastroSDR cannot send on your behalf at all, though you can still export drafts and send them yourself.
The AI drafts included with a paid plan
Paid plans include a monthly allowance of AI drafts that run without you connecting anything. Those drafts are generated through our provider account, which makes that provider a subprocessor for your prospect data whenever the allowance is used.
| Provider | Purpose | Data involved |
|---|---|---|
| DeepSeek | Writes the AI drafts included with a paid plan, on MastroSDR's own account | The prospect details and pitch used to generate an email. Only while the included allowance is in use. |
This applies only while you are drawing on the included allowance. Connect your own AI key and every generation goes through your account instead, from that moment on, and this provider stops processing anything of yours. Point MastroSDR at a self-hosted or local model and nothing leaves the machine you name.
Changes
We will update this page and notify account owners by email before adding a subprocessor that processes customer personal data.