My outgoing email suddenly will not send to any recipients. Message reads “ The sender address was invalid”
Hi @Sheridan1956.
Do you see an error code along with the message?
Are you using the app?
Speak soon,
Katie
How are you using your email. Is it with an email app or are you using a web browser?
Are you presently a BT Broadband customer or are you paying for your email through a BT Premium email account?
If neither of the above your email account may have been downgraded to a BTMail Basic account which can not be used with an email client or email app.
See link
https://www.bt.com/help/email/bt-email-products