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Why do you want to serve another notice? Is the s21 defective? If not just take the next step - apply to the court for possession.

I hope it’s not. I know the dates are fine and he’s had all the paperwork. The only niggle I have is he claimed he didn’t receive the Form 6A. Which is crap I copied myself in to another email address and I received it. Oldest trick in the book.
He has breached his agreement in numerous ways and he has been childish and pathetic.
But I guess your right i just need to bite the bullet and file for possession.

Did you just send it by email? Email’s are apparently easy to fake, so he may be able to convince a judge. Do you have his signed agreement to serve noyices by email? If not then its not properly served.