Help & documentation
Guides, references and troubleshooting for TDesk.

Spam filtering & DKIM

Inbound spam filtering is handled by MXGuard on every domain. This page covers outbound authentication — DKIM, SPF and DMARC — so your mail is trusted by other servers.

Setting up DKIM

  1. Go to Mail Services → DKIM.
  2. Each mail domain gets a signing key; the matching DNS record is published for you when TDesk runs your DNS.
  3. If your DNS is elsewhere, copy the DKIM TXT record shown into your DNS.
  4. You can regenerate a key if needed (update the DNS record afterwards).

SPF & DMARC

  • SPF — a TXT record listing who may send for your domain.
  • DMARC — a TXT record telling receivers what to do with mail that fails checks.
  • Use DNS health checks to confirm all three are in place.

Allow / block specific senders

Use the whitelist and blacklist in Mail Services to always-allow or always-block particular addresses or domains.

If you're dealing with mail being marked as spam, this is a sensitive area — correct authentication usually fixes deliverability.