|"You" or "your" can sound accusatory, especially in an email.
Recently my boss kept writing "your SQL"1 when it wasn't my SQL, it was a coworker's.
The SQL had problems in it and I felt like I was being accused of making mistakes. He should have said "The SQL ..."
I often say the word "You" when I mean "I" or "People." I'm trying to break this habit but it's a work in progress.
If you say "You didn't reply to my email." you could be wrong.
Say "I didn't see the reply to my email."
I learned this lesson the hard way. I once sent this to someone and it turned out that they did reply a few days prior and I didn't see it. So saying "I didn't see ..." covers you and makes your point.
1. SQL is Structured Query Language, a tool to retrieve data from a database.