Listserv issue involving yahoo addresses

[Rory Larson]

Hello all,

A problem has cropped up this week that affects the functionality of the Siouan listserv, along with listservs throughout the Internet.  It seems that Yahoo has recently implemented a non-orthodox protocol to prevent email spoofing by requiring that messages coming from Yahoo addresses must also come from a Yahoo server.  This breaks the functionality of relaying, which is required for a listserv to operate.  So if I post on the listserv from my Yahoo account, the listserv receives my message and relays it to your account.  It goes to your Inbox with my Yahoo address, but the point of origination is the listserv server, which is not Yahoo.  If you are unfortunate enough to have a Yahoo address as well, then your Yahoo server decides that I must be a bad guy, since my Yahoo-addressed message is not coming from a Yahoo server.  To protect you, it rejects the message.  This bounces it back to the listserv server, which concludes that your email account is an invalid address.  After about four days of this, it quietly unsubscribes you from the list.  So Yahoo's new security functionality acts to kill Yahoo accounts off of listservs.  (Or at least, that's the way I fuzzily understand it.  Loren will undoubtedly correct me if I'm wrong.)

Below is the statement sent out this afternoon by our listserv system administrator.  The triage solution is for the listserv to reject any posts coming from Yahoo email addresses.  That way, Yahoo users will not be unsubscribed and will get the same messages everyone else gets.  But until things get worked out between Yahoo and listservs, they will not be able to post to the list.

Thanks,
Rory

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A recent change implemented by Yahoo to combat email spoofing has caused issues with mailing lists on listserv.unl.edu.  The new policy implemented by Yahoo requires messages from the @yahoo.com domain to originate from a yahoo.com server.



When a user from Yahoo emails a list, the message gets relayed by listserv.unl.edu.  This causes it to be rejected by many of the recipients.  The rejection goes to listserv.unl.edu, which causes them to be unsubscribed from that list.



This affects every email list on the Internet that receives email from an @yahoo.com address.  The solution that most have implemented is to reject messages from the @yahoo.com domain so their list subscribers don't get automatically dropped.



We have taken immediate action by implementing this as of

4:10 p.m. 4/11/2014.  As more information becomes available we will provide updates.



You are receiving this message because your address (rlarson1 at unl.edu<mailto:rlarson1 at unl.edu>) is recorded as one of the owners of each of the following lists:



siouan





Thank you,

Jim Liebgott

UNL Listserv Administrator

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