This is a question that I've been wanting to ask for some time. Once your IPs are warm and you have a solid list that your regularly emailing, at what frequency do you add new data? Here's how I've been doing it. I'm looking for any suggestions on the process. Example Setup Let's say that I have: Note: This isn't my exact setup, just a sample scenario. 240k in a list that I regularly email 100 IPs 100 emails-per-hour / per-ip (2,400 emails/day per ip) :shot: Still with me?... Total daily sending: 240,000 emails Speed I've been adding 3-5% new data daily, my new feeds aren't all that big usually 5k new records/week. I try to get the new data out as fast as possible. So, with a daily sending limit of 240k, I've been able to add 5k to the list quickly (the same day). On the occasion that I get a larger list, I follow the same algorithm adding a max of around 12,500 new records. Note: These feeds are coming from trusted sources, this isn't some junk scraped data. IP Distribution I distribute the load of new data over all of my IPs. So, when I queue my mail, I do some math. If I'm emailing every hour: Each hour I send out 10,000 emails. I inject 5% of my new data into this. 10,000 * 0.05 = 500 So, that 500 (new data) gets distributed evenly across my 100 ips. So each IP gets 5 new emails per hour. The breakdown is 95 emails (old data) + 5 emails (new data). Conclusion I trust my data sources, but you never know what's going to happen with data that you've never mailed. I've found this solution to work fairly well, however, it might be overkill. I'm curious to see how everybody else is introducing new data to their existing feeds. I do my best to keep my IP reputation high :stupid: Nobody likes to "start over".