I thought I could use:
mail -s "Subject_here" -a "In-Reply-To: Message_ID_here" < body
but unfortunately the -a is unrecognised.
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2 Answers
I found this way of using sendmail instead:
/usr/lib/sendmail -t < body
The file body should have each header on a separate line, then a blank line, then your message body text:
To: [email protected]
From: [email protected]
Subject: Example of conversation threading
In-reply-to: <put Message-ID of previous mail here>
Body text here
I think -a for additional header does not work in case you mail command is Heirloom mailx. In Heirloom mailx -a flag is for file attachment. As you answered to yourself, you can use sendmail, but you can also use -t flag to Heirloom mailx, too.
mail -t < body
The body text is same as that of your own answer.
To: [email protected]
From: [email protected]
Subject: Example of conversation threading
In-Reply-To: <put Message-ID of previous mail here>
Body text here
This worked for me.
