I'd say check their DMARC records. It also helps if you can get onto their spam feedback loop at ReturnPath. Andrew From: LISTSERV Site Administrators' Forum [mailto:[log in to unmask]] On Behalf Of Karen Belfi Sent: Tuesday, January 27, 2015 2:54 PM To: [log in to unmask] Subject: Comcast Anyone else having all comcast emails bounce? We started with one comcast person not receiving any emails. Now all our comcast members are bouncing. -- Karen with Isis, Pete, Mabel and Nik www.BlindDogRescue.org ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1