July 11, 2015, 4:00am (UTC) -
This service incident has been resolved. Our service monitors have confirmed that email is being delivered normally to yahoo accounts for the past several hours. We continue to monitor email transactions and work closely with Yahoo to ensure reliable email delivery. Thank you for bearing with us during the investigation of this issue, and for helping us gather the facts necessary to reach its resolution. Again, we are truly sorry for the frustration this incident has caused.
We will share the results of our post-mortem investigation on this issue as soon as we have them.
On June 28, 2015, we saw a significant increase in customers reporting Zendesk email being delayed or refused for delivery at yahoo.com. After a detailed investigation, we have determined that email sent from a subset of our servers is being blocked as spam by Yahoo. The majority of the impact is being felt by customers in our EMEA data center.
We reported and then escalated this issue with Yahoo and are currently working directly with them to resolve the issue. We acknowledge this process is frustratingly slow and we know that email communication is a critical channel for you. We have made resolution of these delivery failures a top priority.
We do not yet have an ETA for resolution but are making progress working with Yahoo. We will continue to update you as we get more information. Please note that this problem only affects emails addressed to Yahoo mail domains (see below for a representative list of yahoo mail domains). This does not impact email addressed to other email domains (e.g. gmail, hotmail, etc).
Let us know if you have any followup questions by emailing us at firstname.lastname@example.org.
Emails to the following domains were subject to delivery failures as part of this incident:
rocketmail.com yahoo.ae yahoo.at yahoo.be yahoo.ch yahoo.co.id yahoo.co.il yahoo.co.in yahoo.co.jp yahoo.co.nz yahoo.co.th yahoo.co.uk yahoo.co.za yahoo.com yahoo.com.ar yahoo.com.au yahoo.com.br yahoo.com.co yahoo.com.hk yahoo.com.hr yahoo.com.mx yahoo.com.my yahoo.com.ph yahoo.com.sg yahoo.com.tr yahoo.com.tw yahoo.com.vn yahoo.cz yahoo.de yahoo.dk yahoo.es yahoo.fi yahoo.fr yahoo.gr yahoo.hu yahoo.ie yahoo.in yahoo.it yahoo.nl yahoo.no yahoo.pl yahoo.pt yahoo.ro yahoo.ru yahoo.se ymail.com