If you mean getting a confirmation that the mail was read, then it can be done, if I take your question literally, then no.
But the ways to achieve that have nothing to do with Perl, and it's an evil thing to want. In either case, if I knew you were doing this, I'd go offline before opening your mail - if I did so at all.
It is none of your business if folks in your userbase choose not to disclose their real email address to you.
Makeshifts last the longest.
Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.