Three statements are given, followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. 

Statements: 

All posts are e-mails. 

Some posts are letters. 

All emails are telephones. 

Conclusions: 

I. Some telephones are letters. 

II. No email is letter.