My Wix email blast to Comcast addresses resulted in huge number of soft bounces this week. Why?

@XfinityThomasB​ 

I am asking as a business person SENDING emails to a subscribed database. I want to know why my e-newsletter - that I have been sending for years to a subscribed database - was all of a sudden bounced to 900 comcast email addresses. These are people who have been receiving and opening the newsletter weekly until july 3 when they began to bounce. SOmething must have change with xfinitiy's spam filter that is making this happen. I want to know how to fix that so they DO NOT bounce!

user_yedg1r I understand you are the sender. You are sending what is known as a "mass marketed email". These style emails are traditionally picked up by spam or junk filters on popular email systems. As we are the ISP providing the email system that you are inquiring about, I can only tell you that we have a great spam/junk filter, and it is designed to stop these style emails you are sending. I provided you a great link you will want to read over. The link covers everything about our email system, but, you would want to pay attention to the section labeled "Email safe list" this is the feature you will need to inform the recipients about. This feature allows the user to designate certain promotional email addresses like yours, as a safe email they would want to receive from. 

in another thread I read that the sudden issue of hundreds of soft bounces to comcast domain recipients is happening to another nonprofit.  We are continuing to have the very same problem. Our settings are all in compliance, and Comcast is the only domain in which over 800 are soft bouncing.  The majority are the same people, but a few added each time.  It begin on July 3rd, then July 7th and today just now.  We need to get this rectified. What can we do?  Important!!!!

@XfinityAlex​ I am going through the same thing. We have 1,700 bounces when normally we average about 200. Most are coming from Comcast. Can we raise this issue with tech support that deals with your spam filters? These are all opted-in and highly engaged people on our list who want to hear from us. 

Maybe see my post:

https://forums.xfinity.com/conversations/email/comcast-incoming-email-blockage-and-xfinity-comcast-support-circus/66abe3f438e9a26c9e6d4abb

My blocks started happening about two weeks ago.  I have 12 Comcast members on one email group.  Their are "soft bounces" in the sense that my sending server (which has worked fine with Comcast since at least March) is getting a "421 Server Temporarily Unavailable" message, causing it to retry.  But it always gets this error, for the last two weeks.

Either:

1) Comcast is blocking a lot more IP addresses for incoming mail than they used to, for reasons they do not explain, or

2) these IP addresses used to be on temporary block lists / graylists, but they are not being released from this graylisting for some reason, or

3) your problem is different, and the mail is being blocked after being accepted, presumably from a more finely-tuned spam filter.

But I don't expect we'll ever hear a real answer -- they can act with total impunity in the name of "protecting their customers", even if it's because they no longer deliver mail that the customers actually want.

user_826q0v thank you for reaching out today, have you already reached out to our Customer Security Assurance team regarding this email issue?