To: ... - Email "To" Addresses

This section provides an email message example with 'To: ...' header to specify a list of recipients with their names and email addresses of the email message.

What Is "To: ..." Email Header? "To: ..." specifies a list of primary recipients of the email message, The recipient list is provided in the following format:

recipient, recipient, ...

where: 
  recipient = [display_name] <email_address> | email_address 
  display_name  = plain_name | =?encoded_name?=
  plain_name    = enclosed in double quotes to protect comma 
  email_address = account@domain_name

examples: 
  To: herong@herongyang.com, chloe@herongyang.com
  To: Herong Yang <herong@herongyang.com>, 
      "=?utf-8?Q?Dion, Chlo=C3=A9?=" <chloe@herongyang.com>

Here is a simple example of email message with a list of 2 recipients with encoded and quoted display names in the "To" header.

Return-Path: <joe@herongyang.com>
Delivered-To: herong@herongyang.com
Received: from 127.0.0.1 (localhost [127.0.0.1])
  by mail.herongyang.com (Postfix) with ESMTP id 5EABD266002B;
  15 Nov 2023 06:19:34 -0500 (EST)
Message-Id: <20231113111946.5EABD266002B@mail.herongyang.com>
Date: 15 Nov 2023 06:19:34 -0500 (EST)
To: Herong Yang <herong@herongyang.com>, 
  "=?utf-8?Q?Dion, Chlo=C3=A9?=" <chloe@herongyang.com>

Hello world!

Table of Contents

 About This Book

 Introduction to Email

 Postfix - Mail Transport Agent (MTA)

 SSL/TLS Secure Connections with Postfix Server

 Dovecot - IMAP and POP3 Server

 SSL/TLS Secure Connections with Dovecot Server

 Email Client Tools - Mail User Agents (MUA)

 Mozilla Thunderbird - Mail User Agents (MUA)

 PHPMailer - PHP Package for Sending Emails

Email Message Format and Headers

 Email Message Format and Example

 What Are Email Message Headers

 Content-Type: text/html - HTML Content

 Content-Type: multipart/alternative; boundary="..."

 Content-Type: multipart/mixed; boundary="..."

 Content-Transfer-Encoding: 8bit - Non-ASCII Content

 Content-Transfer-Encoding: base64 - Base64 Encoded Content

 Content-Transfer-Encoding: quoted-printable - 7-Bit Encoding

 Subject: =?...?= - 7-Bit Encoding

 From: ... - Email "From" Address

To: ... - Email "To" Addresses

 Received: from ... by ... - SMTP Server Log

 References

 Full Version in PDF/EPUB