About p25.dev

What is p25.dev?

p25.dev is a subscription based service that gives you inbound (MX backup) and outbound (relay) email infrastructure for your self-hosted email server. We monitor your email servers and your DNS configuration and alert you if delivery or reception of emails could be disrupted.

For the MX backup, you can receive as many emails as you like. Sending has a generous allowance based on your subscription tier.

The choice of MTA is yours. We provide our in-house developed Mail Delivery Agent Postern. You could also use software such as Postfix if you are willing to invest more time for a custom setup.

Who we are

Raphael Sprenger

p25.dev is a service offered by Sprenger Company B.V., a Dutch company focused on secure IT infrastructure.

We got somewhat internet famous with the free RSS TLS monitoring tool and a monitor for the Go sumdb.

My name is Raphael Sprenger, and I am the founder of Sprenger Company B.V. I am happy to receive friendly and constructive feedback via raphael@p25.dev.

If you want to encrypt the message, use age and the key age1xv7u7f8sf2cjh3uv62w0zsrplyr49kvcjxzqmv6d6yy3fwwkrp4s6ndjnq.