Do Smartermail got recall function?

Unfortunately, the Smartermail does not have a built-in email recall or “undo send” function.

Once you click Send in SmarterMail, the email is immediately pushed into the outgoing spool and delivered via standard SMTP rules. After the recipient’s mail server accepts it, it cannot be pulled back.

The reason Smartermail does not have such feature was due to Protocol Limitations. SmarterMail relies heavily on standard internet email protocols (like SMTP). The standard email framework for the wider internet has NO delete after delivery command.