Limited: Recipient mailbox is over quota or rate limit.
No MX or MX Error: No Mail Server or Mail Server Error.
Catch-All: Recipient email can not be verified.
Timeout: Mail Server does not respond.
SPAM Block: Mail Server has a strong SPAM protection.
You can mix and match formats or content โ the system is flexible and intelligent enough to detect and process what matters.
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๐ MailTesterNinjaApp 1.5 is now available for Windows!
Our powerful email validation utility is now packaged as a standalone Windows application โ no installation required. Just download, unzip, and start verifying your email lists instantly. Designed for speed, accuracy, and privacy, MailTesterNinjaApp makes bulk email validation easier than ever.