Hello guys, Hope you're doing well. I recently had a server (9 sending IPs). the IPs and the domain are listed ivmSIP24, --apparently they had a bad sending history. (However they did not had any sending volume in the past month, both SenderScore and SenderBase show no sign of sending in the last 30 days) after about ~5k email sent. the message get blocked by gmail. this is the 1st message: I noticed when I change the url in the message the emails gets delivered. after few thousands of emails. I get the same error. I change the URL again everything is good for few thousands. the 3rd time, I got a different error: Now, even without any URL in the message. I got blocked. the smtp is properly configured. The email list not optin, but clean and mailed it one month before. following bulk senders guideline. and I did not had issues with Yahoo no Hotmail every this is good with them. I was wondering if you guys now what could be the root cause of this issue? Could it be the number of IPs or the total volume coming outta this sender? and what are the possible reasons that would cause the rejection? Thank you very much Iss.