That's all I have done for the last ten years on my web sites and I
don't get much spam.
Steve
If you have an email address as a link (and sometimes as text)
anywhere in a web page it will be picked up by spammers. It doesn't
matter if you like to it with a graphic or not - if the mailto link is
behind the scenes it will be picked up. The spammers are not manually
reviewing pages, they have programs fetching and looking for mailto
links and apparent email addresses and grabbing the addresses.
The only real solution is to use a form and send the data to a program
on a server that filters spammers and send the email to the
destination from the program.
A javascript routine that builds the link from scratch or otherwise
obfuscates will cut out almost all of the problem (except the fact
that not everyone has JS turned on).
The obfuscation link previously posted is a good start when teamed
with a graphic for the visual address. That still irritates people who
want to cut and past the address, but it stops most spammers.