if ($$dstref =~ m,\Aimaps?://,i) { # already canonicalized
require PublicInbox::URIimap;
my $uri = PublicInbox::URIimap->new($$dstref)->canonical;
$$dstref = $$uri;
if ($$dstref =~ m,\Aimaps?://,i) { # already canonicalized
require PublicInbox::URIimap;
my $uri = PublicInbox::URIimap->new($$dstref)->canonical;
$$dstref = $$uri;