We have identified some issues with the email delivery in the past few days, we have looked into it and we're looking into possible solutions.
Currently we had to clear the backlog of emails due to the huge number of unsent emails, from our analysis the majority of emails did not contain any crucial information and were caused by a software bug which caused a incredibly high amount of mails to be sent.
If you experienced issues with email delivery in the past few days please get in touch with us via support and we will look into it, currently we're monitoring the situation and looking into solutions to prevent this from happening in the future.