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# Frequently Asked Questions (FAQ)

> Find answers to common questions about PostNuvia, from core concepts to best practices and security.

#### What is PostNuvia?

PostNuvia is the first email provider built for AI agents. While traditional email APIs are
built for sending one-way notifications, PostNuvia is built for two-way
conversations, making it easy to create agents that can read, understand,
and reply to emails in a thread, just like a human would.

#### How is PostNuvia different from services like SendGrid or Mailgun?

The key difference is our focus on **conversational agents**. Services like
SendGrid are excellent for transactional emails (receipts, password resets)
and marketing campaigns. These are done via a GUI. Resend is an API that is
great to do those transactional emails as well. BUT PostNuvia is built for
the unique challenges allowing agents to have 2-way conversation over email,
with first-class support for concepts like `Threads`, `Inboxes`, and
`Attachments` to manage complex, stateful conversations over email.

#### Can I use my own custom domain to send emails?

Yes, absolutely! While you can get started instantly with an `@postnuvia.com`
inbox, we highly recommend setting up your own custom domain for production
use. This improves deliverability and ensures emails come from your brand.
You can find a complete guide [here](/custom-domains).

#### Can I set a profile picture for my inbox?

PostNuvia does not currently have an API field for the sender picture shown
by a recipient's email provider. You can associate a Google profile photo
with your PostNuvia address without a certificate, but display depends on
Google. BIMI is a separate option for domain branding, and Gmail requires a
VMC or CMC certificate for it. See [Inbox profile pictures](/knowledge-base/inbox-profile-pictures) for setup steps and limits.

#### What's the best way to process incoming emails?

For production applications, **Webhooks are the recommended method**. They
provide real-time notifications and are far more efficient than constantly
polling the API for new messages. You can learn how to set them up in our
[Webhooks Overview](/webhooks-overview).

#### How do I get just the new content from a reply?

Use `extracted_text` or `extracted_html` on the Message object. PostNuvia
strips quoted text automatically, so you get only the new reply content.
See [Reply & Attachment Extraction](/reply-extraction) for details, including
extracted text for attachments.

#### How do I make sure I don't end up in spam?

Email deliverability is a complex topic. We go in depth in our [Email Deliverability best practices guide](/email-deliverability).

#### Do you have SDKs available?

Yes! We currently offer official SDKs for Node.js/TypeScript and Python to
make integrating with PostNuvia as easy as possible. You can find links and
information in our [API reference](/api-reference).

#### Is there a free tier?

Yes. The free tier includes 3 inboxes and 3,000 emails per month, no credit
card required. Start at [console.postnuvia.com](https://console.postnuvia.com).