Highland Park listserv e-mails from Yahoo accounts

Neighbors, I took a look at my spam folder this morning and realized that all e-mails coming from Yahoo accounts to the listserv were in there. The reason given is that the e-mail can't be authenticated as coming from an actual Yahoo address. This obviously isn't true since I can see that the e-mail is going to the listserv. Not sure how to resolve this other than checking your spam folder whenever you see traffic from the listserv in your inbox. I thought I'd let everyone know about this. Reggie