mailgun.tf

resource "mailgun_domain" "example_mailing_domain" {
 name          = "m.example.com"
 spam_action   = "disabled"
 smtp_password = "strong_password"
}

resource "cloudflare_record" "mail-receiving-dns-entry" {
 count = 2
 domain = "${cloudflare_zone.my_domain_entry.zone}"
 type   = "${lookup(mailgun_domain.example_mailing_domain.receiving_records[count.index], "record_type")}"
 name   = "${mailgun_domain.example_mailing_domain.name}."
 value  = "${lookup(mailgun_domain.example_mailing_domain.receiving_records[count.index], "value")}"
 priority = "${lookup(mailgun_domain.example_mailing_domain.receiving_records[count.index], "priority")}"
}

resource "cloudflare_record" "mail-sending-dns-entry" {
 count = 3
 domain = "${cloudflare_zone.my_domain_entry.zone}"
 type   = "${lookup(mailgun_domain.example_mailing_domain.sending_records[count.index], "record_type")}"
 name   = "${lookup(mailgun_domain.example_mailing_domain.sending_records[count.index], "name")}."
 value  = "${lookup(mailgun_domain.example_mailing_domain.sending_records[count.index], "value")}"
}