China has recently blocked all email clients from sending mail. I use Thunderbird for a pop3 account. When I try to send mails, they are blocked and I receive a message stating my mail is spam. If I use the same pop3 account via the state-approved browser site, the mail will go. The block problem occurs for all email clients in the Ubuntu repository [Evolution, Claws, Sylpheed]. I am told Outlook has no such problems. Obviously, China has cut a deal with MS for back doors.
Might anybody know how to work around this to enable T-bird to send emails ?