I've pointed this out one or two times. FWIW I'm one of the moderators for this listserver and I guess that a Yahoo bug causes this on the e-mails I moderate. You didn't say that you find it annoying, but I sure do. I wonder if it happens to other moderators.
I thought of contacting Yahoo but the thought reminds me of Hitchhikers Guide To The Galaxy where the notification that the Earth will be destroyed for a hyper-space bypass was located in the closed-off section in the basement on a library on a planet near Alpha Centauri. Sorry for the way-too-long sentence.
I'll get off my keister and and try to contact Yahoo. Any suggestions are welcome.
Alan