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Sets the in-reply-to ID of this message.
An in-reply-to ID is similar to the in-reply-to IDs that are used by email systems to track replies.
Typically you set the in-reply-to ID to be the message ID of the message to which this message is replying, if any.
A client can use the InReplyToID header field to link one message with another. A typical use is to link a response message
with its request message.
You cannot alter this header after the message has been sent.
In the following example, when a message is received that contains a reply-to-address, a reply message is created and sent
containing the message ID in the in-reply-to-id:
declare @msgid varchar(128);
declare @rmsgid varchar(128);
declare @replyaddr varchar(128);
set @msgid = ml_qa_getmessage( 'myaddress' );
set @replyaddr = ml_qa_getreplyaddress( @msgid );
if @replyaddr is not null then
set @rmsgid = ml_qa_createmessage();
call ml_qa_settextcontent( @rmsgid, 'message received' );
call ml_qa_setinreplytoid( @rmsgid, @msgid );
call ml_qa_putmessage( @rmsgid, @replyaddr );