PowerMTA handles DKIM signing natively. You need to generate a public/private key pair, add the public key to your DNS records, and point PowerMTA to the private key.
Major inbox providers like Gmail and Yahoo enforce strict authentication requirements. PowerMTA can sign your outbound messages with DomainKeys Identified Mail (DKIM) automatically. powermta configuration guide top
| MTA | License | Architecture | Native IP Pools | Scriptable | Best suited for | | --- | --- | --- | --- | --- | --- | | | Commercial | Java (JVM) | ✅ (vMTA) | ❌ | Large enterprises requiring commercial support and battle‑tested reliability | | KumoMTA | Open Source (Apache 2.0) | Rust (async) | ✅ (Lua) | ✅ (full Lua) | Technical teams seeking PowerMTA‑grade features without license fees | | Postfix | Open Source | C (multi‑process) | ❌ (requires external tools) | ❌ | General‑purpose inbound/outbound mail, internal relays | | Haraka | MIT | Node.js (event loop) | ✅ (plugin) | ✅ (JavaScript) | Developers comfortable maintaining their own MTA infrastructure | PowerMTA handles DKIM signing natively
Alex knows a clean config is a happy config. He uses parameter inheritance to keep his files "DRY" (Don’t Repeat Yourself) and sets up version control so he can quickly roll back if a change causes issues. PowerMTA can sign your outbound messages with DomainKeys
# Feedback Loops (FBL) enable-fbl yes
