I like the iconography and the colours. Icons in 25,18,27 and 26 are best as they are distinctive rather than just a simple envelope. I like the grey "secure email for health" rather than the green.
I like the font in #18. Could we combined that with the logo from #25 (but make the sub-text grey as in the others)?
Need to be careful with #32, it is very close to our New Zealand Post logo (www.nzpost.co.nz) which we don't want to do otherwise we may infringe their intellectual property. I think #25 is distinct enough to avoid this however.