SMTP Server responded: failed | Domain contains control or whitespace

[Clarissa3814]

I'm sending an email to a client and have gotten the 'Subject' in red at the top of my New Transactional Email window.

What does it mean? Is it fixable?

Thanks!

[Clarissa3814]

And in sending the same email to another user, I go the same first part, with 'Local address contains....'

???

[Chopper326]

Can you please provide a screenshot or error message of what you're experiencing?

[Clarissa3814]

APWT Domain Control Error 5.25.22.png (44.96 KiB) Viewed 51 times

[Chopper326]

I'm seeing in this image that there's an error in your customer's email address.

You can delete the space between the '@' and the 'g' in your 'To: address' to fix this issue and please let me know if the error message still persists.