The Blog
Hard-won lessons on email verification, inbox placement, and keeping your sender reputation spotless — from the team that's been verifying email since 2000.
Anti-spam laws and compliance: CAN-SPAM, GDPR, CASL
Learn how using SPF all=ip4:* can accidentally enable email spoofing. See real risks and how MailTester's verification stops bad sends before they happen.
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Fix email bounce issues fast with real-time DNS lookup and email verification. Identify invalid addresses, catch-alls, and domain problems before sending.
See how DKIM selector DNS propagation delays affect email delivery and learn how to test for them.
Ensure your Arabic, Hebrew, or Urdu messages land in inboxes. Use MailTester to verify deliverability, prevent bounces, and maintain sender reputation.
Learn why DKIM signatures fail when email body exceeds 1024 characters. Fix authentication errors, improve deliverability, and verify your list with.
Understand how relaxed vs simple DKIM canonicalization impacts email signature validation and deliverability.
Fix 'sender IP subnet not recognized by domain' errors. Use real-time verification and inbox placement testing to validate SPF alignment and improve.
Fix SPF misalignment in shared email routing paths to reduce bounces and improve inbox placement.
Discover how a sudden IP reputation drop kills email deliverability. Learn the root causes and fix them with real-time verification and inbox tests.
Discover how email verification services analyze reporting URI format to assess domain security, reduce bounces, and improve deliverability.
Boost inbox placement and sender reputation by configuring DNS across multiple email providers.
Resolve email deliverability issues caused by SPF alignment and envelope From in relayed emails.
Stay sharp
Occasional, practical notes on verification and inbox placement. No spam — we'd be embarrassed.
