diff --git a/backend/plugins/org/e2e/raw_tables/accounts.csv b/backend/plugins/org/e2e/raw_tables/accounts.csv
index 6bbdb2a8f98..9b1f09eb84e 100644
--- a/backend/plugins/org/e2e/raw_tables/accounts.csv
+++ b/backend/plugins/org/e2e/raw_tables/accounts.csv
@@ -1,6 +1,7 @@
 "id","created_at","updated_at","_raw_data_params","_raw_data_table","_raw_data_id","_raw_data_remark","email","avatar_url","full_name","user_name","organization","created_date","status"
 "a1","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","e1","","n1","n1","","2022-07-10 14:27:43.813",0
 "a10","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","e15","","pq","n10","","2022-07-10 14:27:43.813",0
+"a11","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","E6","","zz","zz","","2022-07-10 14:27:43.813",0
 "a2","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","e1","","n2","n2","","2022-07-10 14:27:43.813",0
 "a3","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","e2","","xyz","n3","","2022-07-10 14:27:43.813",0
 "a4","2022-07-10 14:27:43.813","2022-07-10 14:27:43.813","","",0,"","e4","","n4","n4","","2022-07-10 14:27:43.813",0
diff --git a/backend/plugins/org/e2e/snapshot_tables/user_accounts.csv b/backend/plugins/org/e2e/snapshot_tables/user_accounts.csv
index 4e89a081177..1e66cceb992 100644
--- a/backend/plugins/org/e2e/snapshot_tables/user_accounts.csv
+++ b/backend/plugins/org/e2e/snapshot_tables/user_accounts.csv
@@ -1,6 +1,7 @@
 account_id,user_id,_raw_data_params,_raw_data_table,_raw_data_id,_raw_data_remark
 a1,U111,,,,
 a10,U010,,,0,
+a11,U006,,,0,
 a2,U112,,,,
 a3,U113,,,,
 a4,U004,,,0,
diff --git a/backend/plugins/org/tasks/user_account.go b/backend/plugins/org/tasks/user_account.go
index 45f187e3b8c..30cd37b76a7 100644
--- a/backend/plugins/org/tasks/user_account.go
+++ b/backend/plugins/org/tasks/user_account.go
@@ -24,6 +24,7 @@ import (
 	"github.com/apache/incubator-devlake/core/plugin"
 	"github.com/apache/incubator-devlake/helpers/pluginhelper/api"
 	"reflect"
+	"strings"
 )
 
 var ConnectUserAccountsExactMeta = plugin.SubTaskMeta{
@@ -42,11 +43,14 @@ func ConnectUserAccountsExact(taskCtx plugin.SubTaskContext) errors.Error {
 	if err != nil {
 		return err
 	}
+	// Email addresses are compared case-insensitively: a corporate git config and a provider
+	// profile routinely record the same address with different capitalisation, and matching them
+	// exactly silently drops links that should be made.
 	emails := make(map[string]string)
 	names := make(map[string]string)
 	for _, user := range users {
 		if user.Email != "" {
-			emails[user.Email] = user.Id
+			emails[strings.ToLower(user.Email)] = user.Id
 		}
 		if user.Name != "" {
 			names[user.Name] = user.Id
@@ -76,7 +80,7 @@ func ConnectUserAccountsExact(taskCtx plugin.SubTaskContext) errors.Error {
 
 		Convert: func(inputRow interface{}) ([]interface{}, errors.Error) {
 			account := inputRow.(*crossdomain.Account)
-			if userId, ok := emails[account.Email]; account.Email != "" && ok {
+			if userId, ok := emails[strings.ToLower(account.Email)]; account.Email != "" && ok {
 				return []interface{}{
 					&crossdomain.UserAccount{
 						UserId:    userId,