Is 150 contacts too small for IP warming?

Hi all,

I'm kicking off an IP warming campaign soon. I can't find any info on what is the minimum effective list size for this process.

The current target audience I have is about 150 contacts. Is this too small to get the job done? 150 contacts total means we'll only be sending to 2 contacts every day for the 1st week, 6-7 for the 2nd, 8-9 for the 3rd and up to 14 for the 4th. These numbers seem a bit low to me.

This is an engaged audience. It is possible to select a bigger group and formulate a different campaign but we would expect the results to not be as good.

Does anyone have input on this topic?

Thanks,

James