Sending Email On Behalf Of

February 26, 2008 · 1 min read

When you get an email from a yahoo group list, for example, it might say it was sent from yourgroup@yahoogroups.com on behalf of the person who actually sent it.  Both addresses will be included in the message.

This is done in SMTP with the SENDER header.  If the Sender header is present, the email client should identify the mail as being "from" the sender you specify in the SENDER header (they are "the responsible mail submitter"), on behalf of the from-address that you specify in the FROM header.  You can do it with IP*Works! by simply adding the SENDER header (which is not the same as the FROM header) using the OtherHeaders property, ie:

smtp.OtherHeaders = "Sender: sender-address@mydomain.com";

So, to send an email from test@mylist.com on behalf of the someuser@somedomain.com, just say:

smtp.OtherHeaders = "Sender: test@mylist.com";
smtp.From = "someuser@somedomain.com";
smtp.SendTo = "test@nsoftware.com";
smtp.Subject = "SendOnBehalfOf";
smtp.MessageText = "message text";
smtp.Connect();
smtp.Send();

You can use the OtherHeaders property to specify any custom headers you'd like, multiple headers should be separated with a CRLF.

This article is part of the GWB Archives. Original Author: Lance Robinson

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