[IBL] yahoo mail problem identified

[Sean Sweda]

As I surmised, Yahoo changed something on their end which is causing the bounced/undelivered messages.  I may be able to figure out a workaround, but in the meantime my recommendation is that anyone who is using Yahoo mail switch to another provider for IBL business, as it is unlikely your mail to the mailing list or team aliases will ever get delivered.  

https://help.yahoo.com/kb/mail/SLN24016.html
http://www.pcworld.com/article/2141120/yahoo-email-antispoofing-policy-breaks-mailing-lists.html

Sean