I have used Firefox for many years. Now I can receive E-mail but cannot send it from Firefox. Just re-installed Mozilla and still cann't send E-mail.....

I cannot send mail from Firefox. Can receive E-mail but cannot send it. This worked OK until today. I have had firefox for many years. Just reinstalled Mozilla and still cannot send E-mail from firefox.
I use comcast.net for E-mail,using Mozilla to get there.

If your Office email account's SMTP authenticated?
Any error message provided and if so, what?
Are you also accessing an email account and SMTP server provided by SBCGlobal.net with either email client and if so, are you able to send messages with this account and SMTP server when connected to the internet via SBCGlobal.net at home?
And let me get this straight - both email clients work fine without any problems sending messages with your Office email account and SMTP server when connected to the internet at a friend's house that uses another ISP besides SBCGlobal.net but this is an Apple problem?
If an Apple problem, then you'd have problems sending messages with this account and SMTP server regardless whose network and ISP you are connected to.
Regardless what this more than likely under-trained or just unaware person at SBCGlobal.net told you, all ISPs have restrictions on using an SMTP server that is outside of their network or that isn't provided by the ISP used for connecting to the internet.
Some ISPs allow the use of an authenticated server only that is outside of their network but some block its use regardless.
Within the last year or so, SBCGlobal.net made a drastic change in regards to such restrictions and conveniently neglected to inform their customers beforehand. Those using an SMTP server that was outside of SBCGlobal.net's network regardless if the SMTP server was authenticated were required to "opt out" of Port 25 blocking with SBCGlobal.net in order to use an SMTP server that was outside of their network which was working fine before this change was made.
Have you opted out of Port 25 blocking with SBCGlobal.net?

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