If I can send and receive via the ISP WEB email, I can send via other apps. Now if you were spamming it is possible that an ISP would restrict you to WEB ONLY email but you would know if you did that or flamed a few folk.
Besides why not get a new gmail account to avoid being locked out when and if you change ISPs?
Back in August, I was suddenly prevented from sending email. After calling my ISP I was told that I was on a spamlist created by some company that they would not name. I was using thunderbird at the time. They suggested I log on to their website where I would be able to read and send emails, which I have been doing ever since.
Has anyone ever experienced a similar situation?