Determines envelope RCPT TO address to be send to destination server.

A String value.  

object.MailTo [= value]

The MailTo Property syntax has these parts:

MailTo property holds email address of the recepient, as it will be provided to 'RCPT TO' command when message is sent to destination server. This doesn't have to be same as 'To' field used in email. Technically, once relay connects to the server, communication goes like this:

220 weonlydo.com ESMTP; Fri, 15 Aug 2003 02:02:45 +0200
HELO weonlydo.com
250 weonlydo.com Hello weonlydo.com, pleased to meet you
MAIL FROM: kreso@weonlydo.com
250 <kreso@weonlydo.com>, Sender ok
RCPT TO: general@weonlydo.com
250 <general@weonlydo.com>, Recipient ok
DATA
354 Please start mail input.
this is a test
.
250 Mail queued for delivery.
quit
221 Closing connection. Good bye.

As you can see, line marked with red color is used from MailTo property.

You may want to put MailTo value between < and > characters, because some servers will reject the message if email address does not contain them. So, if you set

Relay.MailTo = "<joe@usa.net>"

server will accept it ok.

You can specify more than one recipient for the message. However, in such cases wodSmtpServer will always find mail exchangers based on first specified recipient! When connection with the server is established, wodSmtpServer will send multiple RCPT TO commands, one for each specified recipient in this property. If server rejects any of these recipients, you will get an error! You should use multiple recipients only when you are sure that remote server will accept the message for each recipient (for example, if you use remote server as your Smarthost server). This property allows multiple recipients only to allow you to send same message to same server but to more than one user, instead of creating multiple relays even message always is delivered to same server. Important: in MailTo property, multiple recipients are delimited by CRLF (VbCrLf) and not by comma or semi-colon!