Isn't that what the general WP post comment feature is for?

If you don't want other people to see those post relevant user comments, you could simply remove the code that shows the comments from your theme...just a thought.

On the other hand you can of course use cforms as well, if you need dynamic admin addresses, you can use your code and replace the $to variable in the mail() functions with it (in cforms.php) , e.g.:

search for @mail( and replace:

@mail($to, ... with @mail(get_the_author_email(), ...

This should work. 

Great! Also, note that you need to only make the above adjustment for the admin email, neither for the auto confirmation nor CC email.

Very odd indeed. Have you cloned the first form or did you start the second form from scratch?

Try cloning the first form and give this new form a shot, if it also doesn't work we need to dig deeper. If it does, chances are you misconfigured the second form that currently doesn't work. 

Dear Oliver,
I am trying to replicate this dynamic admin email feature by following your instructions above.
I modified cforms.php, line 626 from:
$sentadmin = @mail($to, encode_header($vsubject), $fmessage, $headers);
To:
$sentadmin = @mail(get_the_author_email(), encode_header($vsubject), $fmessage, $headers);
This resulted in no email being received at all (at the author email address).

Since I thought it was likely that the author email address was not fetched correctly I tried replacing $fmessage with the fetching function instead:
$sentadmin = @mail($to, encode_header($vsubject), get_the_author_email(), $headers);
This resulted in a totally blank email being sent to the mail address defined in the form GUI (as expected).
It seams like the get_the_author_email() function call is somehow outside the loop when called from cform.php which results in the NULL value return.
Please let me know you think and what I am doing wrong

Ps.
The form (nr 2) used in the test above has then been entered into the default single.php just above the comment template, like this:
…

<?php insert_cform('2'); ?>    
<?php comments_template(); ?>
<?php endwhile; else: ?>
<p>Sorry, no posts matched your criteria.</p>
<?php endif; ?>
…

You are so quick in your replies
Yes please give me some pointers on how to get hold of the post ID using the Tell-a-friend feature.

In reality I am storing the admin email addresses in custom fields which I access by using:
<?php get_post_meta($post->ID, $key, true); ?> where $key denotes the custom email field.
So if there is way to get hold of the Post ID from within cform.php and then
use

...
$to =  get_post_meta($postID, $key, true);
$sentadmin = @mail($to, encode_header($vsubject), $fmessage, $headers);
...

It would work perfectly.

Many thanks!
Shall a ‘Tell-a-friend’ field be added to the form to get
this to work? 

Ps
1. The released v5.4 solved the Captcha reload feature perfectly.
2. I tried the non-ajax submission mode with no success.

Ok the post-ID is now part of the form, can you now access your custom values (for a fiven post, e.g. author email)?

What are you trying to send to the post author?

What do you get in the email (if you get one at all)?

Is the $to now being properly set? 

Just passing $AjaxURL may not be good thing, since you may be missing some of the header info (that in fact have to go into the body) - for testing rather try: $fmessage .'(postID='. $AjaxURL .')'

What do you need the $content for? 

Thanks for clarifying!

Sorry I forgot something on my end: in addition to this line

... <input type="hidden" name="cforms_pl'.$no.'"  ...

you also need to move the other one:

... <input type="hidden" name="cforms_pid'.$no.'"  ...

outside the IF block, which of course makes the IF superfluous  :-)

See if that makes it work (and properly sets the $AjaxURL). 

I'm happy to send you a (stable beta) copy of v5.5 which comes with a WP Comment feature, ie. the user gets to choose whether his note is in fact treated as a regular comment on the post or as a note (email) to the post author.

With very little modification you could also make this feature to not be optional and only send the message as a note.The only requirement is that the post including the form is written by that person with a valid email address in his WP profile.

You could choose to replace your standard WP comment form with the cforms one (with the benefits outlined) or simply use the cforms one for those specific bio pages. All up to you.

Of course you can run these cforms forms in parallel, have a standard contact form (email goes to the one configured in cforms), a WP comment mimicking form and ...well, how many other ones you need.

Sorry, misread your initial post. You're right, neither the solution above nor the new WP Comment feature will in this case help you.

The only solution would be - like you said - to pass on the recipients address at run-time. Which currently is not supported.

A possible workaround (haven't tested it though) may be to utilize the 'Multiple form mail recipients' feature.

1. Add the authors emails addresses to the cforms admin email setting: email1 (Joe), email2 (Pete), email3 (Mike)
2. In your dynamic form include a multi-recipients field that gets 'build' at run-time (see examples below)
3. Via CSS hide the entire input field, so users neither can see it nor change it

re. item 2 (dynamic field):

in order to pick the right author, you need to dynamically change the order and IDs, e.g. to pick email1 (Joe), the field name needs to be:

Send to#Joe|0#Pete|1#Mike|2

if you you'd like to send it to Pete,

Send to#Joe|1#Pete|0#Mike|2

In the code (cforms.php) you only need to change this line (~1999):

$field.= '<option value="'.(($field_type=='emailtobox')?$jj:$opt[1]).'" '.$checked.'>'.$opt[0].'</option>';
to

$field.= '<option value="'.$opt[1].'" '.$checked.'>'.$opt[0].'</option>';

That should be it.