\newcommand{\lang}{english}% needed for date formatting
\newcommand{\name}{Firstname Lastname}
\newcommand{\street}{Your Street}
\newcommand{\zipCity}{Zipcode, City}
\newcommand{\mobile}{+1 234 56789}
\newcommand{\email}{[email protected]}
\newcommand{\dateposted}{\today}

\newcommand{\recipient}{
Recipient name\\
Some street\\
Some city\\
}