We have been working on a global rollout since past few months for a major product of ours. We did the IP warming in phase 1 in May for our North America launch and we use a Marketo issued dedicated IP. We have the following records in place
1) A record - xyz.abc.com and bounce.xyz.abc.com
2) SPF - Includes our dedicated IP
5) PTR - currenty only points to bounce.xyz.abc.com.
The email is sent from xyz.abc.com and we are seeing a high soft bounce rate in Europe with our recent launch, almost 50%. We are looking at possibilities of the higher soft bounces. I felt we should have PTR pointing to both bounce.xyz.abc.com and xyz.abc.com. However, we never had such higher bounces in past campaigns.
We found our IP and domain are in SORBS Blacklist, per mxtoolbox. There is no other blacklist for the IP. I was told by Marketo to ignore SORBS as it isn't recognized anymore by mail clients anymore. Does the IP warming we did for our north america launch help with Europe launch or do we need to do the IP warming again? I was wondering how ISP's treat IP launches based on target regional launches.
Any ideas on what could be the issue?