Hmm, that's strange. How are you trying to send emails in Firefox: using your provider's webmail site (logging into your provider directly) or using an add-on or third party website that connects to your provider?

Or did you mean Thunderbird?

juanderfool said

I cannot send emails via FireFox, must go to native provider to send. Inconvenient!

I try using Thunderbird which does not work. It worked for years prior to it stopping. I must go to my providers in order to send original or respoiding emails.

Thanks jscher2000

It's possible that your provider has made a change.

I think STARTTLS usually is used with port 587, instead of the standard SSL port 465.

Could you look up your provider's current SMTP settings to see whether your "Outgoing Server" settings need to be updated? If it's difficult to translate between your provider's help page and Thunderbird's dialog controls, you could provide a link to your provider's help page.

Also post your Troubleshooting Information please. Help (Alt-H) - Troubleshooting Information