Looking on the internet deeply has found these results:

I attach it to this email is the most popular phrase on the web.

I attach it in this email 10 results on the web	I attach it to this email 13 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Mar 8, 2007 ... I attach it to this email so that you don't have much work if you want to tweak it and include it in your tar. Cheers [Icon Theme] Name=iComity�... Nov 26, 2013 ... Internet Protocol. Conformance & Interoperability can be addressed in relation to. Capacity Building, so I attach it to this email. I also attach my Jul 27, 2011 ... We arrived weeks after the fighting and as the figures show in our report (I attach it to this email), much of the populations had already returned�...

I attach it in this email

10 results on the web

I attach it to this email

13 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Mar 8, 2007 ... I attach it to this email so that you don't have much work if you want to tweak it and include it in your tar. Cheers [Icon Theme] Name=iComity�...
Nov 26, 2013 ... Internet Protocol. Conformance & Interoperability can be addressed in relation to. Capacity Building, so I attach it to this email. I also attach my
Jul 27, 2011 ... We arrived weeks after the fighting and as the figures show in our report (I attach it to this email), much of the populations had already returned�...