msmtp-runqueue

#!/usr/bin/env bash

QUEUE="$1"
QUEUEDIR="$HOME/.msmtpqueue/$QUEUE"
LOCKFILE="$QUEUEDIR/.lock"
MAXWAIT=120

OPTIONS="-a $QUEUE"

# wait for a lock that another instance has set
WAIT=0
while [ -e "$LOCKFILE" -a "$WAIT" -lt "$MAXWAIT" ]; do
    sleep 1
    WAIT="`expr "$WAIT" + 1`"
done
if [ -e "$LOCKFILE" ]; then
    echo "Cannot use $QUEUEDIR: waited $MAXWAIT seconds for"
    echo "lockfile $LOCKFILE to vanish, giving up."
    echo "If you are sure that no other instance of this script is"
    echo "running, then delete the lock file."
    exit 1
fi

# change into $QUEUEDIR 
cd "$QUEUEDIR" || exit 1

# check for empty queuedir
if [ ! "`echo *.mail`" = '*.mail' ]; then

    # lock the $QUEUEDIR
    touch "$LOCKFILE" || exit 1

    # process all mails
    for MAILFILE in *.mail; do
        MSMTPFILE="`echo $MAILFILE | sed -e 's/mail/msmtp/'`"
        echo "*** Sending $MAILFILE to `sed -e 's/^.*-- \(.*$\)/\1/' $MSMTPFILE` ..."
        if [ ! -f "$MSMTPFILE" ]; then
            echo "No corresponding file $MSMTPFILE found"
            echo "FAILURE"
            continue
        fi
        msmtp $OPTIONS `cat "$MSMTPFILE"` < "$MAILFILE"
        if [ $? -eq 0 ]; then
            rm "$MAILFILE" "$MSMTPFILE"
            echo "$MAILFILE sent successfully"
        else
            echo "FAILURE"
        fi
    done

    # remove the lock
    rm -f "$LOCKFILE"
fi

# remove empty queue dir
cd && rmdir --ignore-fail-on-non-empty $QUEUEDIR

exit 0