LRNT-020: Use empty string for the domain itself rather than '@'

Signed-off-by: Ulises Tirado Zatarain <ulises.tirado@cimat.mx>

mail.tf

@@ -16,14 +16,13 @@ data "aws_secretsmanager_secret_version" "crm-current" {
 }
 
 locals {
-  mail-server = terraform.workspace == "production" ? "" : trimsuffix(local.zone_prefix[terraform.workspace], ".zatara.in")
   mail-secret = jsondecode(data.aws_secretsmanager_secret_version.crm-current.secret_string)
 }
 
 resource "aws_route53_record" "crm-code" {
   for_each = toset(local.configuration.sdlc.environments)
   zone_id  = local.kingdom.zone_id
-  name     = local.mail-server == "" ? "@" : local.mail-server
+  name     = ""
   type     = "TXT"
   ttl      = 172800
   records  = [local.mail-secret["code"]]
@@ -32,7 +31,7 @@ resource "aws_route53_record" "crm-code" {
 resource "aws_route53_record" "crm-dkim" {
   for_each = toset(local.configuration.sdlc.environments)
   zone_id  = local.kingdom.zone_id
-  name     = "mail._domainkey.${local.mail-server}"
+  name     = "mail._domainkey"
   type     = "TXT"
   ttl      = 172800
   records  = [local.mail-secret["dkim"]]
@@ -41,7 +40,7 @@ resource "aws_route53_record" "crm-dkim" {
 resource "aws_route53_record" "crm-dmarc" {
   for_each = toset(local.configuration.sdlc.environments)
   zone_id  = local.kingdom.zone_id
-  name     = "_dmarc.${local.mail-server}"
+  name     = "_dmarc"
   type     = "TXT"
   ttl      = 172800
   records  = [local.mail-secret["dmarc"]]