mailcheck

#!/bin/bash
# lookup SPF, MX & DMARC records for a domain

usenserv='1.1.1.1'

if [ -z "$1" ]; then
    echo "usage: mailcheck domain.tld"
    exit 1
fi
domain=$1
spf=$(dig @${usenserv} TXT ${domain} +short | grep -i spf)
if [ -z "$spf" ]; then
    echo "SPF: none"
    HASPF=0
else
    echo "SPF: $spf"
    HASPF=1
fi
dmarc=$(dig @${usenserv} +short TXT _dmarc.${domain} | grep 'v=DMARC1')
if [ -z "$dmarc" ]; then
    echo "DMARC: none"
else
    echo "DMARC: $dmarc"
fi
mx=$(dig @${usenserv} +short MX ${domain})
if [ -z "$mx" ]; then
    echo "MX: none"
else
    mx=$(echo "${mx}" | sed 's/^[0-9]* //')
    for i in ${mx}; do
        echo "MX: ${i}"
    done
fi