fix style and make subscription case insensitive

cropswap-sendmail.sh

@@ -24,7 +24,7 @@ mk_subject(){
 }
 
 tee >(reformail -c -x "Subject:" >subject) original | "${MIME_INJECT}" "To unsubscribe, send an email to $MAILGROUP, with [UNSUBSCRIBE] as the subject (square brackets included)." "$(cat <<EOF
-<div class="banner"><span>To unsubscribe, click <a href="mailto:$MAILGROUP?subject=[UNSUBSCRIBE]">here</a> or send an email to $MAILGROUP, with [UNSUBSCRIBE] as the subject (square brackets included).</span></div>
+<div class="banner" style="position:sticky;top:0;background-color:#00f;color:#fff;width:100%;text-align:center;padding:0.5em;box-sizing:border-box;"><span>To unsubscribe, click <a href="mailto:$MAILGROUP?subject=[UNSUBSCRIBE]">here</a> or send an email to $MAILGROUP, with [UNSUBSCRIBE] as the subject (square brackets included).</span></div>
 EOF
 )" "$(cat <<EOF
 .banner{position:sticky;top:0;background-color:#00f;color:#fff;height:2em;width:100vw;text-align:center;padding:0.5em;box-sizing:border-box;text-transform:uppercase;}
@@ -44,8 +44,7 @@ reformail \
 	-I "List-Subscribe: <mailto:$MAILGROUP?subject=[SUBSCRIBE]>" \
 	-I "List-Post: <mailto:$MAILGROUP>" \
 	-I "List-Unsubscribe-Post: List-Unsubscribe=One-Click" \
-> headers
-cat headers body > mail
+| cat - body > mail
 
 
 declare -A SUBSCRIBED

filters/subscriptions

@@ -3,7 +3,7 @@ if ($MAILGROUP ne "")
 {
    if (/^Subject:\s*\[(SUBSCRIBE|UNSUBSCRIBE)\]\s*$/)
    {
-      SUBSCRIBE=$MATCH1
+      SUBSCRIBE=toupper($MATCH1)
       CONTINUE=1
    }
 }