My business account was having trouble with Comcast, Earthlink and Juno this week. All email to those servers were bounced back. Some spam designation with in the server that hosts us. Comcast and Juno are back online. Earthlink has been down for about 4 days. Luckily hardly anyone I need to email uses them. Could be something like that.
Guys, This is What I do for a living for the largest “ESP” (Email service provider) in the US and the world.
Comcast has the most stringent filters, and with the bank fraud, they have gotten tighter.
If the sender doesn’t have perfectly matched and valid:
-From Address matching the registration of their IPs
-DKIM value
-Domain Key value
-DNS matched to the registered of the IP withg appropriate MX and A records matching the sending source.
-A strong listed reputation with the major ISPs
Then it will not ever be guaranteed to get through. You’d think most major brands and publishers would have all that sorted out, but its not true. Most go with the minimum requirement, which leaves out the DKIM, and Domain Keys, and even a matched from address. They think they can get by on the DNS, MX , and A being “Valid” alone.
Publishers like you’re mentioning are the worst clients =!