I'm attempting to create text for an envelope. The sender is in the top-left corner, and the recipient should be centred vertically and horizontally with respect to the edges of the paper. That is, the presence of the sender should not change the vertical alignment of the recipient.
\documentclass{letter}
\usepackage[papersize={110mm,220mm},landscape,margin=5mm,twoside=false]{geometry}
\setlength\parskip{0pt}
\pagestyle{empty}
\begin{document}
If undeliverable, please return to:
Joe Citizen
12345 Foo St
Bar BAZ 67890
\huge
RECIPIENT LINE 1
RECIPIENT LINE 2
RECIPIENT LINE 3
\end{document}
How can I vertically centre the RECIPIENT
lines with respect to the entire page? The block itself should be centred, but text within it should be left justified.