Hi there,
Thanks for letting us know. We’ve looked into this and there does appear to have been a change at Pocketbook in how emails to their Send to Pocketbook service are handled.
Emails which previously went through via Push to Kindle, will now only go through if you change the ‘Send from’ address to ‘kindle@fivefilters.org’.
If you’ve not sent from this address before, you will receive an email from Pocketbook with the subject line:
The email from the unknown address was sent to your device email xxx@pbsync.com
You will then need to click the ‘add to whitelist’ link in the email. You should then see the following screen:
From now on, Push to Kindle will be able to deliver your articles.
If you use a different address in the ‘send from’ field of Push to Kindle, their service will silently reject the email.