Difficulty Sending Emails - Yahoo "From" Email Address

On April 4th, 2014 Yahoo.com implemented a change to their email system linked to a policy titled DMARC.
DMARC stands for Domain-based Message Authentication, Reporting & Conformance and it is an email authentication policy that aims to prevent spoofing and spamming linked to the"From" email address on messages.

The change in this policy implemented by Yahoo prevents emails with a From address ending in @yahoo.com from being sent through systems outside of Yahoo. Because of this, any messages sent from ACTIVE Works Camps or Class Manager using a Yahoo From address will be rejected. Updating your From email settings ensures your confirmation and broadcast emails continue sending successfully.

To update your confirmation email:

1. Click Setup under season name
2. Click Confirmation Email from right side
3. Click Customize button 
4. Update FROM email address
5. Click Save and Continue

To update broadcast email From email address:

1. Click Emails tab
2. Click New > New email
3. Update FROM email address
4. Click Save