p25.dev

Independent relay for self-hosted mail. Delivery, Spooling, Monitoring. 100% EU hosted.

p25.dev +---------------------+ +-------------------+ +----------+ Port 25 | | Any Port | | | Internet |---------->| Inbound Backup MX |-------------->| Self-hosted | | |<----------| Outbound Mail Relay |<--------------| Mail Server | | | | 24/7 Monitoring | Ports | e.g. Stalwart/mox | +----------+ | | 25, 587, 2587 | | +---------------------+ +-------------------+
01
SMTP Relay

Standards-conform delivery. Good IP reputation. Bypasses port 25 blocks. All with a generous sender allowance per day.

02
Backup MX & Spooling

Use our MX as primary or secondary. We accept and queue mail and deliver to you, even if your mail server went offline for a while. Let us deal with the internet's port 25 traffic and just receive mail on any port you like.

03
DNS Monitoring

We monitor your domains for correct TLSA, SPF, DKIM and DMARC records. Furthermore, we monitor your self-hosted mail server for reachability. If anything is wrong, we alert you.

We've been running email infrastructure for years. Small scale for ourselves and large scale for our customers with millions of emails delivered per day.

p25.dev relays and spools your email — we treat email like a "hot potato", meaning we forward emails as fast as possible. If we spool emails, they are encrypted at rest. We make sure to use TLS encrypted connections whenever available for your mails in transit. We never inspect or index emails. We respect GDPR and data minimization.

We practise what we preach. All our business and private mail runs via p25.dev.

The company behind p25.dev, Sprenger Company B.V., was founded in 2022. Subscription fees are enough to keep the servers running. That's all we need for a robust, long-lasting service to handle your mail.

Sprenger Company B.V. is a registered legal entity (KVK 84730897).