Category
Verifying email addresses, bulk checks, the verification API, accuracy, and what each verdict (valid, invalid, catch-all, risky) really means.
1603 posts
Find and fix SPF include recursion depth over 5 with MailTester’s email verification tool. Clean your list, improve deliverability, and avoid bounce.
Verify email addresses with precision: our API validates DKIM body canonicalization and spacing variations for accurate deliverability testing.
Discover how inconsistent b= field padding in email headers undermines automated verification tools and what to do about it.
Discover how some email receivers ignore SPF failures despite RFC standards — and why verified addresses still bounce.
Fix SPF record validation errors on unregistered domains during email verification. Learn why it happens, how to diagnose it, and how MailTester helps.
Understand how SPF alignment timing and policy enforcement windows impact email verification accuracy.
Fix SPF domain existence test failures in email verification. Learn why unregistered domains trigger errors and how MailTester’s 98.9% accuracy identifies.
Ensure your email list is clean and deliverable by using an email verification platform that detects canonicalization risks from line ending flaws.
Detect and fix body canonicalization errors in mixed encoding multipart/alternative messages with automated email validation.
Discover how b= field padding variations cause inconsistent email verification results. Learn why MailTester delivers accurate, consistent verdicts — no.
Resolve SPF record lookup timeouts caused by DNS throttling during bulk email verification. Learn how MailTester prevents delays with optimized DNS.
Stop email verification failures from SPF redirect loops. Learn how MailTester detects and resolves domain loop issues in real-time, improving.
