Pipe email to PHP, alter "To:", then send message

[sparhawk]

I am trying to create a PHP email forwarding script that does the following:
Input: Takes the email from a pipe. (this part I have working)
Process A: Grab a series of recipient email addresses from a database (this part I have working)
Process B: (done for each email address in the series above): Alter the email by changing the "To:" field to one of the email addresses in the series, without messing up the integrity of the message, including any attachments. (this part is getting very messy)
Output: Once the email has been edited to send it to my designated recipient(s), send the message to those recipients.

I understand that the normal PHP mail function isn't this flexible, unless I dissect the whole email into the individual parts and re-assemble them, which I have done, but this messes up some of the emails.

I have tried pulling the message apart using Mail_mimeDecode, and can easily alter the "To:" line as desired.

The problem: Once I have altered the mimeDecode results to include the desired email recipient, how do I reassemble the email and send it without losing any data?

[jseedev]

Seems to me, I'd use the IMAP functions to read the mail box, copy the body contents of the e-mail as a whole, parse the headers into an array, change the To: field, and then reassemble the message(s) anew. This cuts out the need to even decode the mime parts.

[sparhawk]

There is no "mail box" to read with IMAP. The message is created from a PIPE which feeds the email directly to my PHP script. I then want to parse the email, replace the piped email address with the correct recipient address(es), and forward on the message.

I have also now tried to parse the incoming emails with PHP's "mailparse" group of functions, and I can get the recipient email address(es) inserted into the resultant arrays, but I haven't figured out how to re-assemble the email from the parsed arrays, let alone how to send the re-created email.

[sparhawk]

Maybe a little more explanation would help.
I have a very large family. We (meaning I) maintain a password-protected website the family keeps up-to-date contact information including email addresses.

The site is currently written in a funky combination of JavaScript and Perl, and is difficult to maintain. I am looking @ rewriting the whole thing in PHP. I am not very experienced in PHP.

On the current site, I am using Perl to accept the input of an email pipe (whatever@example.com), and change the "To:" address to each member of the family (one at a time), and re-sending the email, so each family member receives a copy of the email.

So the script receives one email sent to "whatever@example.com", and changes the "whatever@example.com" to "myemailaddress@somewhere.com" and sends it to that person, and repeats the process for each family member.

So far in PHP, when I capture the pipe input, look through it and edit the "To:" field as desired, then send the email, it goes to the desired person, but then the entire email (headers, html & plain text, attachments and all) are sent through as the message body.

Is there not a function in PHP that takes a preformatted email (headers, attachments and all) and lets me send it without wrapping its own set of headers around it?