post via e-mail

Hi,
I have read a bunch of postings in this forum relating to this issue but nothing seems to resolve it.

I have set up an email account on my web host. I have put these details in the “post via email” section under options->writing

I have then sent an email to this new email account – which i checked arrives ok.

I have then gone to the browser and typed https://example.com/installdir/wp-mail.php with example.com replace by my site. What i see when i type this is my custom error page.

The blog doesn’t pick up the email and i dont know what i am doing wrong. Any help would be greatly appreciated

Thanks