multiple email accounts as sender

Question

How to send an email from multiple email accounts at the same time to a single account? Means we can enter more than one email address in the from section of new email window.

Answer 1

The Simple Mail Transfer Protocol (SMTP) don't allow for multiple FROM addresses or at least you can do what you want but the SMTP relay server will most likely return a 5xx code (Error).

As mentioned in your comment section, you can take use of the "Reply-To" header. This is what will be used when clicking reply by the receiver if the E-Mail client supports it. It's used typically in simple group message setups that don't have fully functional lists etc.

If you want to use the Reply-To header with multiple e-mail addresses your want to separate them with the expected delimiter that your SMTP server supports. Most common is either "comma" or "semicolon".

Eg

Reply-To: email1@dom.tld, email2@dom.tld, email3@dom.tld

I hope you get it worked out, but short answer is "NO" - SMTP don't support multiple FROM addresses. It also don't make sense to do so as the original sender can always only be one source :)