Change contact email template plain text to HTML format magento
Open app/code/core/Mage/Contacts/etc/config.xml
Note: You can create your own module and override the contact module config.xml file.
<email>
<contacts_email_email_template translate="label" module="contacts">
<label>Contact Form</label>
<file>contact_form.html</file>
<type>text</type>
</contacts_email_email_template>
</email>
Replace to
<email>
<contacts_email_email_template translate="label" module="contacts">
<label>Contact Form</label>
<file>contact_form.html</file>
<type>html</type>
</contacts_email_email_template>
</email>
