Email DNS records for optimusonline.nl
MX, SPF, DMARC and DKIM records published for optimusonline.nl. Registered via The Registrar Company B.v.. Domain age: 6 years.
optimusonline.nl can receive email: 2 MX records found. The MX records point to Proton mail servers. Authentication records found: SPF, DMARC. Not found: DKIM (among common selectors).
| Check | Result | What it means |
|---|---|---|
| MX | Found (2) | The domain is configured to receive email. |
| Mail provider | Proton | Inferred from the MX host names: they point to Proton mail servers. |
| SPF | Found | The record ends with ~all: mail from servers not listed should be treated as suspicious but accepted (soft fail). |
| DMARC | p=reject | The policy is reject: receivers are asked to reject messages that fail DMARC. Aggregate reports are requested (rua). |
| DKIM | Not found among common selectors | DKIM can only be confirmed with the selector used by the sender, so this does not mean the domain has no DKIM. |
Last checked: 2026-10-10 (UTC). DNS records can change over time. This report lists public DNS records; their presence does not by itself mean that a domain or its messages are safe.
Next steps
MX records for optimusonline.nl
- 10 mail.protonmail.ch
- 20 mailsec.protonmail.ch
Email authentication records for optimusonline.nl
SPF record
v=spf1 include:_spf.mlsend.com mx include:_spf.protonmail.ch include:emsd1.com ~all
DMARC record
v=DMARC1; p=reject; fo=1; rua=mailto:1a62917f@in.mailhardener.com,mailto:DqWY785aC9@rua.kdmarc.com; ruf=mailto:DqWY785aC9@ruf.kdmarc.com
Check a specific email address @optimusonline.nl
This page checks how optimusonline.nl is configured for email. It does not confirm that a specific mailbox exists — to check one address, use the form below.