Can you use web mail to send a certificate?

I only use Yahoo mail on my machines (web email). I don’t have Outlook or any email clients installed. Is there a manual way I can use the certificate? I do I use it from using mail on a web browser? Thanks in advance.


No, it is not possible to use a digital certificate with web browser. You need to use any one of the email clients to configure your yahoo email account and install the digital certificate to send a digitally signed/encrypted emails.


Use Thunderbird. Once you get used to it, you will hate accessing Email via your Web Browser.

If you are using more than one machine to access your Email, do this…

  • Open Thunderbird.
  • Select ‘Tools > Account Settings’.
  • Untick the ‘For at most * days’ Box.

Now get a free Digital Certificate from Comodo or wherever, then export it to a Flash Drive or some other Temporary Storage location: It’s always best to keep it backed-up somewhere anyway, just in case.

Then just import it into Thunderbird on the other PC.

Post again if you get stuck. I’ll make sure you’re OK. :slight_smile:

This might be a work-around (I’ve not tried, it’s just an idea):

  • Create a Gmail account.
  • Configure that Gmail account to automatically Forward all e-mail to your Yahoo account, and vise-versa.
  • Install this add-on in Firefox: Gmail S/MIME

It’s a bit of a cowboy job in my opinion. I would just use Thunderbird if I were you:

It’s very easy once you’ve done it the first time.