Cannot email .int email addresses?

I’m trying to email someone who’s got a .int email address, but it keeps erroring out with “Cannot send email”.

The rest of email works properly, so I’m assuming it’s because of that sponsored Top Level Domain (sTLD).

Is anyone else experiencing this?

Pl send a mail with the domain details to helpdesk@e.email. The team should be able to help you with this issue.