Hi! TL;DR version at the bottom.
As we all know IPv4 is like trading gold these days. Back in 2013, we purchased 2 ranges (46.36.204.0/22, 46.36.208.0/21). At the time they did not seem to be very dirty. There were very few listings in RBL's and all in all it seemed like something that should not cause a lot of trouble. We decided to purchase them while keeping in mind that they would not be put to use for a couple of years from the time of purchase. In 2016 (2-3 years after keeping them offline) we started actually using the IP addresses for a new data center. Unfortunately, we quickly found that the /21 range was dirtier than anticipated. We have been spending a lot of time trying to clean the reputation, and we are getting close. However, there is one problem left. Gmail refuses to play with us. DKIM, SPF and all that jazz - nothing seems to help to deliver the mail to inboxes, they always end up in the SPAM folders. We have been in touch with G-Suite support and been trying various ways of getting in touch with Google about this. No matter how we try, we either end up not getting a response or getting told that there is no block for the IP addresses and then a link to bulk sender guidelines. We do follow good practices. We have equal e-mail setup in our other data centers that deliver to Gmail just perfectly. Also delivery to Yahoo, Microsoft and any other provider we know of works just fine as well. As a final test, to ensure that we did not do something wrong by mistake, we tried routing another IP-net to the data center in question and giving one of those IP's to a sending server. Instantly, e-mails started showing up in inboxes rather than spam folders in Gmail/G-Apps. This leads me to the conclusion that somewhere internally in Google, one or both of the ranges are placed on some list that is not accessible/known of by 1st line support. So the question is simply: Anyone who has advice on how to deal with this? Writing off 3.000 IP addresses seems like a quite drastic move. TL;DR version: Bought IP addresses years ago that seemed somewhat clean. Turned up to be dirty and Google doesn't seem to want to clean them. What to do? -- Frands Bjerring Hansen Zitcom A/S - zitcom.dk _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
