# Automatic Emails
**Postmark vs. Resend: What's the Difference?**
Here’s the lowdown:
* **Postmark** has been around for a while and is known for being super reliable. But it allows only transactional emails—things like password resets or order confirmations— So if you're looking to send some marketing content through your app, you might get blocked. Moreover, the apply process takes longer as they have to vet your account.
* **Resend** is newer and focuses on simplicity. It’s straightforward to set up, no application process, with a clean API that doesn’t overcomplicate things. Resend is great if you want to send both transactional emails an marketing emails.
**Which One to Pick?**\
I recently changed it to Resend for the reasons I mentioned above. but I still keep my older apps with postmarks, that way I can benefit from 100 free emails from both platforms which gives me more runaway to test my apps.
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.lightningrails.com/features-setup/automatic-emails.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.