PEC checker
Verify a certified email (PEC) domain end to end: MX records, provider identification, and live SMTP / IMAP reachability — the fastest way to find out why a PEC message isn't arriving.
Diagnose PEC delivery problems in seconds
When a PEC doesn't arrive, the cause is almost always one of three things: the domain's MX records are wrong or missing, the provider's mail servers are unreachable, or the certificate infrastructure (the part that generates receipts) is having an incident. The first two are verifiable in seconds — from outside your own network, which is where the sending servers sit.
This tool resolves the MX records of any PEC domain, recognizes the major certified-mail providers (Aruba, Legalmail, Poste Italiane, Register.it and others), and probes the mail ports on the actual mail host — including the TLS handshake on 465 and 993 — showing exactly where a connection fails.
Businesses that depend on PEC for contracts and legal notices can't afford silent outages. SiteFlux monitors mail servers around the clock — ports, TLS and response time — and alerts you when yours stops answering.
Frequently asked questions
What is a PEC and how does it work?
PEC (Posta Elettronica Certificata) is the Italian certified email system with legal value: when a message is delivered, the provider issues a receipt (ricevuta) that legally proves delivery. It is required for many business-to-government communications in Italy.
How can I check if a PEC address works?
The technical checks are the same as any mail domain: the domain must have MX records pointing to the certified-mail provider (like pec.aruba.it, legalmail.it or pec.poste.it), and those servers must accept SMTP connections on ports 25/465/587 and IMAP on 993. This tool performs all of them from outside your network.
The tool says 'no known PEC provider' — what does it mean?
The domain has MX records (or none at all) that don't match the known certified-mail providers. It may be a normal email domain rather than a PEC, or a provider we don't recognize — check the MX list shown in the results against your provider's documentation.
Can I send a test email with this tool?
No — sending test messages to PEC addresses generates real receipts and would pollute the certified mailbox. Connectivity and DNS checks are the correct non-invasive way to diagnose delivery problems.
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