We are aware that some emails sent to recipients of Yahoo and other addresses hosted by Yahoo mail servers are being blocked. Affected recipients would include yahoo.com, aol.com and sbcglobal.com users. Results will be sporadic due to only some IPs being blocked. The email administrators are working on the resolution. Sending to these recipients through webmail (https://email.firespring.com) may prove successful when sending from a different mail program or app may temporarily fail to deliver. For those that can, encourage recipients to safelist the sending email address or domain. We will post updates when new information is available.