A DV certificate is your opportunity to show the public that any information they send to your site will be encrypted. Along with top-level encryption, you'll also receive an HTTPS web address and a secure padlock icon that indicates your website is protected by an SSL certificate. These days, your typical web user doesn't know what it takes to protect a website, but they know to look for that padlock icon and HTTPS when deciding if a site is secure or not.
Plus, as the web continues to move to an "HTTPS Everywhere" environment, with all sites equipped with at least a basic SSL certificate, businesses, like ecommerce websites and other sites that collect user information, are opting for an Organization Validated (OV) or, especially, Extended Validation (EV) certificate.
That's because indicators like HTTPS and the padlock icon are becoming more and more commonplace, so businesses are looking to EV to help them stand apart from their competitors, since these certificates are the only solutions that come with the green address bar, the most universally trusted indicator on the web.
One thing that's important to remember is that DV certificates offer the same level of protection as other, more expensive SSL products. DV certificates are really a nuts-and-bolts SSL offering, focused solely on encryption. What makes OV and EV certificates the more premium solutions, is that they bolster a website's trust, along with offering first-rate encryption technology
So, if you have an internal testing domain, a template site, or simple blog that you're looking to add basic encryption to, a DV certificate is a wise choice. They're great solutions for those who are only interested in encrypting their website and aren't especially worried about establishing trust with users. DV certificates will protect you, protect your visitors' information, and infuriate hackers.
GeoTrust, RapidSSL, and Comodo certificates all cover both www and non-www automatically if the certificate is generated using www. For example, if you generate a GeoTrust, RapidSSL, or Comodo certificate for www.domain.com, then domain.com will automatically be covered as well. Symantec and Thawte certificates do not automatically cover both www and non-www, but they are all multi-domain compatible. So, you or your customer just needs to purchase an additional domain in order to cover both www and non-www.
No, the common name (or domain name) cannot be changed on a purchased SSL certificate. If you need to change the common name that the SSL certificate has been issued to, you will need to cancel the certificate and reorder with the correct common name.
Yes, a basic DV certificate will work on a mail server. We do have certain certificates available, like the Comodo UC Certificate, that have been designed to work exclusively within an Exchange environment and may be more compatible – but a basic DV certificate will also work.
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