Error: SMTP Error 513

What's Causing This Error

SMTP error 513 occurs when the recipient's email addresses are invalid or contain unsupported syntax. A common cause for this error is copying email addresses off websites and copying unsupported characters along with the selected text.

Solution - Here's How To Resolve It

The easiest way to fix this error is by validating the recipient's email addresses and ensuring that there are no unsupported characters or syntax.