~/.muttrc: Use an aliases/addresses file

But I haven't used mutt itself in ages...

.muttrc

set record="+lu/INBOX.Sent"
set sleep_time = 0 # faster mailbox switching
set alias_file="~/.addresses"
source ~/.addresses
mailboxes +lu/lu \
          +lu.sprd/lu.sprd \
          +htwk/htwk \