For the word (at) >>> Use the @ symbol
For the word (dot) >>> Use the . (period) mark
Don't leave any spaces and type the email address as you normally would any other email address into the "to" line of your email program.
WE WELCOME YOUR EMAIL!
Why we do this?
Spammers have programs which spider through web pages, looking for email addresses, e.g. email addresses contained in mailto: HTML tags [those you can click on and get a mail window opened]. If the email address here was typed in a typical format using the "@" symbol, along with the actual "dot", then more than likely spammers will catch it, and use it to send spam to the email address.