A lot of emails sent to Yahoo mail users get delayed by Yahoo and then blocked.
There is absolutely no reason for them to do so as we only send transactional emails about web-to-print orders and registration info. Our IP address is not listed in any spam databases either. No good as it’s hurting web-to-print sales of our customers.
We contacted Yahoo about this, so hopefully it will get resolved in the coming hours.
In the meantime, it may be a good idea to follow up customers with @yahoo.com emails personally.
We’d like to see all non-delivery reports, if you can be bothered.