Status (by robm at Wed Aug 26 05:24 UTC)
Last week we had some problems with email being delivered to Yahoo accounts. We found that Yahoo were deferring a large number of delivery attempts to their servers.
After contacting the Yahoo postmaster, we were able to get email delivery flowing again, but it seemed a large number of users emails were going straight to the Yahoo “Spam” folder of any account they were sending to.
We’ve since contacted Yahoo postmaster again, and are currently in the trial process of signing up for their whitelisting service. According to Yahoo, the trial will take 2 weeks. From our testing, it appears that email is now going into users Inbox’s again. Hopefully at the end of 2 weeks, we’ll have a full confirmation that we’ve been accepted.
To help with the whitelisting process, we’ve setup a few changes to email delivery:
- We now sign all outgoing email with DKIM (http://www.dkim.org/). This allows providers to forward emails reported as spam back to us, so we can take action against the offending accounts
- We’ve separated outgoing emails onto a number of new outgoing IPs. Previously all outgoing email was sent from the IP range 66.111.4.25-66.111.4.29. These IPs are still used for most email, but email sent via newly signed up accounts uses 66.111.4.221, email sent via accounts detected as sending larger than regular volumes (eg apparently bulk senders) uses 66.111.4.222, and email forwarded via aliases/sieve scripts uses 66.111.4.223.
- We’ve added some additional tests for the spam scanning of outgoing email to try and catch and stop any spam being sent from our systems.
