There's a technique known as obfuscating. That's where regular
characters are converted to their Unicode values. Unicode is normally
embedded in HTML code in the format of the 'and' sign followed by the
number or hash sign then a short series of letters and terminated with a
semicolon.
3+15 converted into Unicode would look like the following in which I've
put a space between the 'and' sign and the hash sign to keep the email
display from converting them into the characters 3+15;
& #51;& #43;& #49;& #53;
I convert the quarterly newsletter for the Pennsylvania Council of the
Blind from Microsoft Office DOC and DOCX formats into HTML to upload to
their site and I convert every email address in those web pages using
this and have never had one of them harvested and used for any spam
purposes. Here's a link to the latest
newsletter; http://pcb1.org/advocates/advocate_spring_2014.html.
Spam-bots are normally very small chunks of code, small so that the size
doesn't register on a web site monitoring utility immediately so they
can't render Unicode like browsers do. The code needed to convert
Unicode would increase the size of the spam-bots to the immediately
noticeable size. The next display of the addition problem I've embedded
into this email is the actual Unicode string. If you look at the source
code of this email, you'll see the Unicode even though in the normal
email display you'll only find the numbers; 3+15
Here's a Wikipedia page on email address
obfuscation; http://en.wikipedia.org/wiki/Email_Address_Obfuscation. I
see no reason why the two couldn't be incorporated. It would stymie the
spam-bots but be clear and readable through browsers and from them
through screen readers.


-- 

No Microsoft garbage used here, sent by a very satisfied Linux-Mint
<http://www.linuxmint.com/> user (a former disgruntled Microsoft user).
You could check out Vinux, Linux for the visually impaired
<http://wiki.vinuxproject.org/>, and on FaceBook.
<https://www.facebook.com/groups/vinux>
This email and any attachments are not virus scanned either, that's up
to you poor Microsoft users to deal with.
Got Windows problems? Who doesn't? Don't toss your cookies, toss your
operating system.
I prefer to be a wild and wacky Linux Penguin than a docile,
domesticated, Microsoft sheep getting fleeced.

Linux user 546139. <https://linuxcounter.net/cert/546139.png>


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