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SSL Help Center
Why do I need SSL on my website?
What's the difference between OptimumSSL and InstantSSL?
Which should I choose, OptimumSSL or InstantSSL?

Before issuing a domain only OptimumSSL Certificate, OptimumSSL CA must authenticate that the entity that requested the certificate is authorized to use the domain for which the certificate is being requested. We can only issue a Web Server Certificate to an organization or individual that can demonstrate control of the domain name in the request by responding to an email message sent to a domain administrator or by supplying documentation that verifies control of the domain.
After generating your CSR, you will be taken to a web page to select an email address attached to your domain. We shall use this address to contact you in order to complete the application process.
Once you have enrolled for your InstantSSL Certificate you will be provided with an Order Number and instructions of what to do next. These instructions will also be emailed to you.
Summary of what we need to do: If we already have a record of your company and domain name(s) we will be able to expedite your SSL application. In most cases, this means that validation of your application and issuance of your SSL Certificate may only take a few minutes.
If we do not already hold sufficient information on your company and domain name(s), or your application data does not completely match the database entry for your website, we may require additional information. These informational requirements will be provided during the enrollment process and via email.
We may request your Business License, Articles of Association or DUNS information (depending on your country and incorporation status). If you are a non-incorporated business or use a trading name please contact us for further instructions.
Acceptable Corporate Documentation
If you are emailing validation documentation please send to docs@comodo.com stating your order number within the email. You can fax your validation documentation to the below number stating your order number on the pages:
US Fax for validation docs: +1 866 831 5837 or +1 866 261 8895
Europe Fax for validation docs: + 44 (0)161.877.1767
Please note that you will only be required to submit either or both of the above if requested during the enrollment process.
For an update on the progress of your application please email docs-enquiries@comodo.com stating your Order Number and requesting an update.