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                                            László Bóra

All address at the same domain becomes invalid if the server responds with 421 4.7.0 Error: too many errors

I'm basically using the sample code without customization: `$validator = new SmtpEmailValidator($emails, $sender); $results = $validator->validate();` The $emails array contains 20 to 50 thousands of addresses when I'm facing the...

All address at the same domain becomes invalid if the server responds with 421 4.7.0 Error: too many errors

Now I had time to dig deeper. The last error is always `421 4.7.0 mx.onbox.hu Error: too many errors`. If I have 20 failed address then this response triggered by...