Add the Stalwart page.

Author: paveloom

content/notes/Stalwart.md

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+title = "Stalwart"
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+
+Stalwart is an open-source all-in-one mail server.
+
+- [Site](https://stalw.art)
+- [Source code](https://github.com/stalwartlabs/stalwart)
+
+## Tips
+
+### DMARC
+
+Outgoing DMARC aggregate reports are sent daily be default. You can lower the frequency to weekly in the settings (SMTP > DMARC).
+
+See [Stalwart Documentation > DMARC > Aggregate](https://stalw.art/docs/mta/authentication/dmarc/#aggregate).