diff --git a/app/stacks/uk-west/applications-service/locals.tf b/app/stacks/uk-west/applications-service/locals.tf
index 13da67007..212582aac 100644
--- a/app/stacks/uk-west/applications-service/locals.tf
+++ b/app/stacks/uk-west/applications-service/locals.tf
@@ -29,7 +29,11 @@ locals {
   )
 
   fo_applications_tech_emails = [for rec in data.azurerm_monitor_action_group.fo_applications_tech.email_receiver : rec.email_address]
-  tech_emails                 = local.fo_applications_tech_emails
+  # Filter emails to stay under 300 char limit for azurerm_mssql_server_security_alert_policy.email_addresses 
+  tech_emails = [
+    for i, email in local.fo_applications_tech_emails : email
+    if sum([for e in slice(local.fo_applications_tech_emails, 0, i + 1) : length(e) + 1]) <= 300
+  ]
 
   tags = merge(
     var.common_tags,