letter late pls help, very worried

<hr>

<p>My son is applying to college. He submitted his common application on time. </p>

<p>However, one of his letters of recommendation was not submitted by his teacher yet. He has hard time getting a hold of his teacher during this week of school vacation. He probably sent 10 emails; however his teacher is very slow in responding. His teacher is not able to access the on line submission, which also make no sense to me. He will possibly mail the latter with delay.
I am very concerned. My son worked so hard on his application. Think is very unfortunate he has to go through this.
I am not sure if sending the letter late will go against my son in the eyes of college admission.
Do we need to include application ID number on pre-addressed envelops? Least we need is the letter to get lost.
Pls advice. I am super worried. Thanks you in advance.</p>

<p>Worried Mother of a teenager</p>

<p>It should be fine. Most colleges give a 2 week leeway for all of that stuff.</p>