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Contact form on your website: why an email address alone isn't enough

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Many small-business websites, especially the simpler ones, stop at an email address written at the bottom of the page, sometimes as a "get in touch" link, sometimes just as text to copy by hand. It looks like the most direct solution: nothing to configure, nothing that can break. For two reasons that don't show up until you go looking for them, it's also the choice that works worst.
The problem you don't see: addresses collected by bots
An email address published in plain text on a web page, whether as text or inside a "mailto:" link, is readable by anyone who scans the page's code, including the software that spam senders use to harvest addresses at scale: they search for exactly that pattern, "something@something.something," inside the HTML.
How much that can cost in practice was measured by Silvan Muhlemann in a 2008 experiment that's since become a frequently cited reference in technical circles: he published nine email addresses, each hidden from bots with a different technique while staying readable to a person, and counted the spam each one received over a year and a half. The address published with no protection at all collected over 1,800 spam emails, against zero for the three techniques that proved most effective. It's a personal experiment, never replicated, and it's nearly twenty years old: I'm not citing it as proof that the exact same thing would happen in the same proportion today, but as a demonstration that the mechanism (a readable address in the code of an indexed page gets found and used) is real, not a hypothesis. A contact form avoids this at the root, because the address messages actually go to never appears in code that a visitor, or a bot, can read.
Mailto doesn't work the same for everyone
There's a second problem, one that's obvious the moment you try it: a "mailto:" link doesn't open a page on the site, it opens the device's default mail program. Nielsen Norman Group flagged this back in 2000: a link, as far as anyone browsing is concerned, should show a page, not launch a different application by surprise.
Since then, a more practical problem has been added, one that more recent web development guides (from 2020 onward) document more precisely: if the device has no mail program configured, which happens more often than people think on a shared computer, on a centrally managed work computer, or for anyone who only uses webmail through a browser, the click leads nowhere useful. A form that opens on the page itself, and sends the message without leaving the site, avoids both problems: it doesn't depend on the navigation assumption a mailto link breaks, nor on what's installed on that device at that moment.
What a form does that an email address can't
Beyond avoiding these two problems, a form lets whoever builds it decide what information is actually needed before the first message even arrives: a name, a phone number, which service is of interest. With a plain email address, the content of the first message depends entirely on whoever writes it, and it often turns out something essential is missing, which means an extra round of emails just to get information a required field would already have collected.
A form can fail too, silently
That said, a form isn't a solution you install and forget. I've written before about a window and door company whose quote request form stopped sending emails without anyone noticing for weeks: the page kept showing the confirmation message, but nothing was arriving on the other end. It's a different risk from spam, but just as real, and the only way to rule it out is to check now and then that requests are actually coming through, rather than assuming a form that works today will keep working forever.
The two can coexist
Neither of these points means the email address should come off the site. Some people prefer to write on their own terms, maybe attaching a document or writing from a program they know well, and they should still be able to. The simplest solution is to keep both: the form front and center for anyone arriving from the site who wants the fastest path, the address still visible, perhaps in the footer, for anyone who specifically looks for it.
If your site's form has been live for a while and you can't remember the last time you checked that it actually works, get in touch and let's check it together: it takes a few minutes, not a project.