Nice work @Sarai_Atoche_Pascual
Here are some comments. Consider anything not mentioned as perfectly solved.
sender-columnclass to correctly align it.
<address>is a block element that automatically breaks the line.
<br>s inside the description list (
<address>around the salutation isn’t necessary.
<blockquote>around the whole line the better choice would be to use an inline quote (
<q>) on the quote itself (Where you used the
<cite>should then be around the source of the quote (The memoirs of Bill S Preston, Esq). You will see that
<q>will automatically add typographical quotes. So you can remove the double quotes in the HTML.
I hope that helps. Feel free to ask questions.
Thank you Miguel for the help