Thanks a lot, kennethk. I agree with you. It is lack of time that tempts to ask a question in a new thread when I see that I need to rephrase it and can't wait to get the answer.
May I ask you one more question. Will it protect if I do the following.
First of all I do not allow attachements. All I need is to reply to the indicated email address with the link to my site with the generated ID. When it is clicked I got confirmation and register this user. When the email address is entered in the form I get it on the server side and make sure that there is only one there. Now, the bot may keep bombarding my form with addresses and pressing submit in the loop. But what I do is I do not accept submissions from the same IP with frequency higher than let's say 5 mins.
What do you think?

In reply to Re^4: No Reply message by vit
in thread No Reply message by vit

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.