First, a domain is a status symbol. In addition, easy to click the wrong link on a touchscreen. Also, a level of competency in electronic messages. Businesses without a domain are not competent communicators. It follows, small screens are harder to navigate. So, website URL on a separate line in digital signatures. Given, good netiquette to include a little click bait. As a result, do provide a hyperlink for a reference.
Website Netiquette Signatures
Next, all email comes from a domain on the Internet. Then, domains have network identifiers. Thus, there is a domain name. Also, internet protocol address for the server. As a result, Universal Resource Locator (URL) represents a domain by name.
In any event, a domain is official. It follows, we need to promote our resources. After, web surfers know where to find us. And so, a form of Search Engine Optimization (SEO) as well. Since, clicks from emails are counted separately.
Many people have separate websites and use other domains in addition to the one from which an email is sent and received. Putting a domain or URL in the signature of a email message provides a reference for the information in the email.
Website URL Netiquette
Domain address because it adds credibility.