python/network/resolve_domains: add Mailchimp mailing sender
python/network/resolve_domains: add Mailchimp mailing sender

k1._domainkey.mydomain is a CNAME to dkim.mcsv.net.

fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared,fishilico/shared