Mail going to spam

[harsh-55places]

I am an engineer at 55places.com. We received reports from our users who have @comcast.net email address that say they are not receiving the automated emails that our system sends starting around April 13.

On April 24, I was able to reproduce this issue using my own comcast.net email address by sending an email from our system to my address. I did not receive any emails in my Inbox or Spam folder.

On April 24, we updated our MAIL FROM (mail.from) domain.

On April 27, our users started to report that they started to receive emails in their Inbox (without making any changes to their Spam Filtering preferences).

Can you tell us why our emails were not being delivered between April 13 and April 27? We’re looking to determine a root cause so we can prevent this from happening again in the future.

I can provide additional details an a private message.

[ComcastCSAEmail]

mixture of content based filtration and one of the sending IPs was blacklisted also likely due to spam/phishing content. 

[harsh-55places]

Thanks ComcastCSAEmail.

We use Amazon SES to send our emails. They use a shared pool of IP addresses for all of their users. So there can be good and bad actors sending emails from the same IP address. Is there a way that Comcast spam filtering accounts for this setup?

Do you know if the IP address that was blacklisted is still blacklisted?

Also, when we changed our MAIL FROM domain, did that improve our spam score so that were were no longer being filtered or was just just a coincidence? 

[ComcastCSAEmail]

---

We use Amazon SES to send our emails. They use a shared pool of IP addresses for all of their users. So there can be good and bad actors sending emails from the same IP address. Is there a way that Comcast spam filtering accounts for this setup?

Not sure what you are expecting for this one... if you are asking if we have someone monitoring all amazon IPs for their email content and clear when we dont see it anymore, then no. Blacklist removal requests all get processed through http://postmaster.comcast.net/block-removal-request.html.

We prefer if the actual IP owner filled them out, but sometimes the domains at fault themselves come clean and fill it out letting us know they have resolved the issue(rare). Other times one of the domains on the IP will request unblock and we process accordingly. In due time if the activity continues, the IP will be blacklisted again.

---

Do you know if the IP address that was blacklisted is still blacklisted?

If you know the specific IP i can check for you(PM it), but if you have a new IP it wouldn't really matter anymore unless you are an engineer for Amazon.

---

---

Also, when we changed our MAIL FROM domain, did that improve our spam score so that were were no longer being filtered or was just just a coincidence? 

---

Sure, but then again spam score isnt the only thing we track for filtration.