Why was my Edit Details change refused?

The messages and what to do

• The business name cannot be empty. The Business Name field is blank or only spaces. Type the name. It is the only field that cannot be left blank.
• That does not look like an email address. The address needs one @, no spaces, and a domain with a dot, such as name@business.com. Paste only the address itself: something like Jane Smith <jane@business.com> is refused, because the name and the space are not part of an address.
• user@domain.com is a placeholder, not a real inbox. Enter the address you want the emails to go to. The message names the address you typed. It looks like a made-up example of the kind websites show as a hint in their forms, such as user@domain.com, yourname@yourcompany.com, john.doe@gmail.com or anything at example.com. Enter the real address you want your emails to go to.
• Could not save. Saving failed without a more specific reason. Click Save Details again. Other problems show their own reason in the same red box.

What is not refused

• Stray characters around an address. Quotes, brackets, commas and semicolons at the start or end of the address are removed before it is checked, so pasting "jane@business.com", or <jane@business.com> works.
• An address whose domain has no mail server. It is still saved, but it is marked (unverified) in the lead header. Check the spelling of the part after the @.
• Blank Contact First Name, Email or Phone. A blank field removes that detail from the lead instead of being refused. For Email, the next address on the lead moves up to become the sending address.