Looking on the internet deeply has found these results:

sent you on monday is the most popular phrase on the web.

sent you monday 144,200 results on the web	sent you on monday 1599,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Madam President, I would like to say to Mr Van Velzen that the questions were officially sent to us on Monday 28 May 2001 and that we shall do everything possible to answer them before the end of the week. Sent Monday at 11.17pm There are no calls, but Ian's cell pinged off of 3 cell phone towers outside of town on Sunday, Monday, and Tuesday. I sent you the locations. See you Monday, unless you're still sick. when she told me she was on her way home from Jenny's. It means I'll see you Monday, Whitley. On 7 June, I sent you a letter regarding the proceedings for Monday 12 June, Whit Monday. President Santer, you are aware of my concern about this because of course on Monday of this week I sent you a fax asking you how as a Parliamentarian I could obtain the opinion of the new committee.	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

sent you monday

144,200 results on the web

sent you on monday

1599,000 results on the web

More popular!

Madam President, I would like to say to Mr Van Velzen that the questions were officially sent to us on Monday 28 May 2001 and that we shall do everything possible to answer them before the end of the week.
Sent Monday at 11.17pm
There are no calls, but Ian's cell pinged off of 3 cell phone towers outside of town on Sunday, Monday, and Tuesday. I sent you the locations.
See you Monday, unless you're still sick.
when she told me she was on her way home from Jenny's.
It means I'll see you Monday, Whitley.
On 7 June, I sent you a letter regarding the proceedings for Monday 12 June, Whit Monday.
President Santer, you are aware of my concern about this because of course on Monday of this week I sent you a fax asking you how as a Parliamentarian I could obtain the opinion of the new committee.

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