AOL mail domains have started to embrace DMARC more explicitly, much like their Email brethren, Yahoo. You may have started seeing bounce messages with the reason of:
**"521 5.2.1 : (DMARC) This message failed DMARC Evaluation and is being refused due to provided DMARC Policy" **
This is because AOL will no longer be accepting messages where the From domain is an AOL mail domain, and the message originates from a non-approved AOL mail domain server/service. This is a security measure they have implemented to help reduce potential address spoofing of their mail domains.
What this means: You can no longer send with the From address being anything from an AOL address when sending to a domain that checks DMARC before accepting mail.
**What you can do: ** You will need to change the From address to a non-AOL address. We recommend using your own mail domain, or one you control that is legitimate. You can then set the Reply-To field to be the original AOL address that previously was used in the From field.
What about these messages, are they lost? : Yes, any send with this bounce message is discarded and tracked as a Block. You will need to adjust your From address field settings, and then try resending from your side.