Emails you send through Yahoo!
® will have
s=s1024 in the DKIM signature.
Messages from any of the following domains will have
d= in their DKIM:
- currently.com
- ameritech.net
- att.net
- bellsouth.net
- flash.net
- nvbell.net
- pacbell.net
- prodigy.net
- sbcglobal.net
- snet.net
- swbell.net
- wans.net