diff --git a/core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/EcosystemManager.kt b/core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/EcosystemManager.kt
index 52012194..635a7176 100644
--- a/core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/EcosystemManager.kt
+++ b/core/src/main/java/com/nextcloud/android/common/core/utils/ecosystem/EcosystemManager.kt
@@ -39,7 +39,12 @@ class EcosystemManager(
         private const val PLAY_STORE_MARKET_LINK = "market://details?id="
         private const val EXTRA_KEY_ACCOUNT = "KEY_ACCOUNT"
 
-        const val ACCOUNT_NAME_PATTERN_REGEX = "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-z]{2,}"
+        const val ACCOUNT_NAME_PATTERN_REGEX =
+            "^[A-Za-z0-9._%+-]+(?:" +
+                "@(?:[A-Za-z0-9-]+\\.)+[A-Za-z]{2,}(?:@(?:[A-Za-z0-9-]+\\.)+[A-Za-z]{2,})?" +
+                "|" +
+                "@(?:\\d{1,3}\\.){2,3}\\d{1,3}(?::\\d{1,5})?" +
+                ")$"
     }
 
     private val accountNamePattern = Pattern.compile(ACCOUNT_NAME_PATTERN_REGEX)
diff --git a/core/src/test/java/com/nextcloud/android/common/core/utils/AccountNamePatternTest.kt b/core/src/test/java/com/nextcloud/android/common/core/utils/AccountNamePatternTest.kt
index e725a7f8..56c63f28 100644
--- a/core/src/test/java/com/nextcloud/android/common/core/utils/AccountNamePatternTest.kt
+++ b/core/src/test/java/com/nextcloud/android/common/core/utils/AccountNamePatternTest.kt
@@ -52,4 +52,11 @@ class AccountNamePatternTest {
         assertFalse(pattern.matcher("").matches())
         assertFalse(pattern.matcher(" ").matches())
     }
+
+    @Test
+    fun `special account name formats`() {
+        assertTrue(pattern.matcher("abc@cloud.com@example.inst2.cloud.com").matches())
+        assertTrue(pattern.matcher("admin@10.0.2.2:55002").matches())
+        assertTrue(pattern.matcher("admin@10.0.2.2").matches())
+    }
 }