All validators are integrated into the platform. They are available directly from the campaign interface in the Postigo dashboard — no need to copy anything separately.
Checks the domain and IP address against 50+ public DNS-RBLs: Spamhaus, Barracuda, SORBS, SpamCop and others. If your SMTP is on the blacklist, providers discard emails even before the content. Run the check regularly: getting on the blacklist often happens after mass mailings with suspicious activity.
Deliverability Guides
Check the domain's MX records. Which servers accept mail, priorities.
Postigo collects four basic checks in one place — all work directly in the browser without registration, using our internal tools that we use ourselves for our mailings.
Check MX
Check the domain's SPF record. Syntax correctness, authorized senders.
Check SPF
Bulk Upload
Server
Daily Limit
Connect your warmed-up SMTP accounts — Postigo automatically rotates them between campaigns for maximum deliverability.