The email addresses belonging to additional recipients.
The email addresses belonging to the secondary recipients.
The email address belonging to the sender.
The email addresses in which responses are to be sent.
The subject line of the email message.
The email addresses belonging to the primary recipients.
Representation of the email headers formatted under the RFC-6854 (supersedes RFC 822). (https://tools.ietf.org/html/rfc6854) standard. Some further rules (beyond RFC 6854) must also be applied to the data:
.
) must not exceed 63 characters.^[a-zA-Z0-9](\.?[-_a-zA-Z0-9])*@[a-zA-Z0-9](-*\.?[a-zA-Z0-9])*\.[a-zA-Z](-?[a-zA-Z0-9])+$
.InternetMessageFormatHeader