I have 10 users out of 50 now affected but this, and the Bug Report is set to private so I can't see status updates for it.
Your using Thunderbird and FREE yahoo account? I had been using Freepops with Thunderbird to get access to free yahoo account, but that stopped working too and started using Ziambra desktop BUT I'm also getting the "SendMessage request failed: Method context doesn't exist" Its a shame because other email accounts other then Yahoo work great! Hope they fix it soon.
SendMessage request failed: Method context doesn't exist
Exact same issue! Zimbra help us!
This is totally unacceptable and makes a mockery out of the press release that VM issued as well as the words of Paul Maritz and Carl Eschenbach when it acquired Zimbra.
Working closely with your partners takes on the semblance of a farce when Yahoo is implementing changes without your knowledge so that you're left scrambling for the next 60 days or more to come up with a fix. Yet the fix is a rather easy one and if it had any priority, you would make a service pack available within days.
VM knows what the issue is (Removing context header in SoapTransport.java allows Yahoo SOAP requests to work on all accounts ), yet will not take active steps to resolve this issue in a timely manner.
Why is that? Why leave hundreds of thousands of ZDesktop users flapping in the wind without the ability to send emails from within your application. Many of them IT professionals. Surely your image advisors could counsel you on such folly.
Get on your social media .. Twitter, Facebook et al. and let Zimbra know this is unacceptable !
Simply remove your Yahoo Account and install a new account using the generic IMAP settings. Just finished testing it. If someone else can confirm the technique that would be great.