Hi and How are you? At present, I have an interesting issue that I am
working on.
We are working as a team providing solutions to the govenmental
institution working on sensitive email system completely based on open
source.
One of the requirement is modification that involves adding a unique id
to the subject line.
Eg.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%
To: MyGoogleId@gmail.com
cc: Postfix_Google@gmail.com
Sub: Reg. Postfix inquiry
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%
As per the requirement the subject line should be
Sub: [12312545467] Reg. Postfix inquiry
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%
The unique ID need to be added to the subject line after the user send
an email to an individual user or the group.

I appreciate for your time and effort spent on this email and thank you
in advance for your responses.
-Saravanan Kannan

Try Altermime:

alterMIME is an integrated email/mailpack manipulation utility. It adds
and modifies headers, adds disclaimers, and changes or removes embedded
attachments.

See http://www.pldaniels.com/altermime/.

I used it to add disclaimers - worked pretty well.

However just changing / adding to the subject field itself could be
handled by a reasonably simple script inserted as a postfix filter.
Try FILTER_README.

Good luck.

gregsmith@smithonline.id.au wrote:

> Try Altermime:
>
> alterMIME is an integrated email/mailpack manipulation utility. It adds
> and modifies headers, adds disclaimers, and changes or removes embedded
> attachments.
>
> See http://www.pldaniels.com/altermime/.
>
> I used it to add disclaimers - worked pretty well.
>
> However just changing / adding to the subject field itself could be
> handled by a reasonably simple script inserted as a postfix filter.
> Try FILTER_README.
>
> Good luck.

Thank you and I am still looking into your suggestions. I will update
this once I get some results after my experimentations. In the mean
time, please let me know if there are some other alternatives.