Contact From 7 is a brilliant plugin for WordPress which allows you to create and easily manage contact forms.
If you have multiple emails or departments on your site and you want the user to be able to select from a drop down menu which email / department to send the email to, then this is the solution.
PLEASE NOTE: You will need both the latest versions of WordPress and Contact From 7 for this to work, or you may get form field errors.
This is the tag you need, separating each email and department name with a pipe. I.e. email@example.com
[select recipient "General Enquiriesfirstname.lastname@example.org" "Technical Helpemail@example.com" "Supportfirstname.lastname@example.org"]
In the Mail details below, where it says To: you’ll need to add <[recipient]>
And voila! The user should now be able to select an email to send to from the form.