diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt b/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
index d4c6a2e0..a34f6af5 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/Extensions.kt
@@ -538,6 +538,12 @@ fun String.md5(): String {
     return BigInteger(1, md.digest(toByteArray())).toString(16).padStart(32, '0')
 }
 
+fun String.sha1Hex(): String {
+    val md = MessageDigest.getInstance("SHA-1")
+    md.update(toByteArray())
+    return md.digest().joinToString("") { "%02x".format(it) }
+}
+
 fun String.sha256(): ByteArray {
     val md = MessageDigest.getInstance("SHA-256")
     md.update(toByteArray())
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Constants.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Constants.kt
index b98c0f33..f16c4f43 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Constants.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Constants.kt
@@ -139,6 +139,7 @@ const val VULCAN_HEBE_ENDPOINT_NOTICES = "api/mobile/note"
 const val VULCAN_HEBE_ENDPOINT_ATTENDANCE = "api/mobile/lesson"
 const val VULCAN_HEBE_ENDPOINT_MESSAGES = "api/mobile/message"
 const val VULCAN_HEBE_ENDPOINT_MESSAGES_STATUS = "api/mobile/message/status"
+const val VULCAN_HEBE_ENDPOINT_MESSAGES_SEND = "api/mobile/message"
 const val VULCAN_HEBE_ENDPOINT_LUCKY_NUMBER = "api/mobile/school/lucky"
 
 const val EDUDZIENNIK_USER_AGENT = "Szkolny.eu/${BuildConfig.VERSION_NAME}"
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/Vulcan.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/Vulcan.kt
index 9dfc1572..d6c2c770 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/Vulcan.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/Vulcan.kt
@@ -14,6 +14,7 @@ import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.api.VulcanApiAt
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.api.VulcanApiMessagesChangeStatus
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.api.VulcanApiSendMessage
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.hebe.VulcanHebeMessagesChangeStatus
+import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.hebe.VulcanHebeSendMessage
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.firstlogin.VulcanFirstLogin
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.login.VulcanLogin
 import pl.szczodrzynski.edziennik.data.api.events.AttachmentGetEvent
@@ -135,6 +136,15 @@ class Vulcan(val app: App, val profile: Profile?, val loginStore: LoginStore, va
     }
 
     override fun sendMessage(recipients: List<Teacher>, subject: String, text: String) {
+        if (loginStore.mode != LOGIN_MODE_VULCAN_API) {
+            login(LOGIN_METHOD_VULCAN_HEBE) {
+                VulcanHebeSendMessage(data, recipients, subject, text) {
+                    completed()
+                }
+            }
+            return
+        }
+
         login(LOGIN_METHOD_VULCAN_API) {
             VulcanApiSendMessage(data, recipients, subject, text) {
                 completed()
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/data/hebe/VulcanHebeSendMessage.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/data/hebe/VulcanHebeSendMessage.kt
new file mode 100644
index 00000000..8f5f5afa
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/vulcan/data/hebe/VulcanHebeSendMessage.kt
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-2-22.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.hebe
+
+import com.google.gson.JsonObject
+import org.greenrobot.eventbus.EventBus
+import pl.szczodrzynski.edziennik.*
+import pl.szczodrzynski.edziennik.data.api.VULCAN_HEBE_ENDPOINT_MESSAGES_SEND
+import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.DataVulcan
+import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.data.VulcanHebe
+import pl.szczodrzynski.edziennik.data.api.events.MessageSentEvent
+import pl.szczodrzynski.edziennik.data.db.entity.Message
+import pl.szczodrzynski.edziennik.data.db.entity.Metadata
+import pl.szczodrzynski.edziennik.data.db.entity.Teacher
+
+class VulcanHebeSendMessage(
+    override val data: DataVulcan,
+    val recipients: List<Teacher>,
+    val subject: String,
+    val text: String,
+    val onSuccess: () -> Unit
+) : VulcanHebe(data, null) {
+    companion object {
+        const val TAG = "VulcanHebeSendMessage"
+    }
+
+    init {
+        val recipientsArray = JsonArray()
+        recipients.forEach { teacher ->
+            recipientsArray += JsonObject(
+                "Address" to teacher.fullNameLastFirst,
+                "LoginId" to (teacher.loginId?.toIntOrNull() ?: return@forEach),
+                "Initials" to teacher.initialsLastFirst,
+                "AddressHash" to teacher.fullNameLastFirst.sha1Hex()
+            )
+        }
+
+        val senderName = (profile?.accountName ?: profile?.studentNameLong)
+            ?.swapFirstLastName() ?: ""
+        val sender = JsonObject(
+            "Address" to senderName,
+            "LoginId" to data.studentLoginId.toString(),
+            "Initials" to senderName.getNameInitials(),
+            "AddressHash" to senderName.sha1Hex()
+        )
+
+        apiPost(
+            TAG,
+            VULCAN_HEBE_ENDPOINT_MESSAGES_SEND,
+            payload = JsonObject(
+                "Status" to 1,
+                "Sender" to sender,
+                "DateSent" to null,
+                "DateRead" to null,
+                "Content" to text,
+                "Receiver" to recipientsArray,
+                "Id" to 0,
+                "Subject" to subject,
+                "Attachments" to null,
+                "Self" to null
+            )
+        ) { json: JsonObject, _ ->
+            val messageId = json.getLong("Id")
+
+            if (messageId == null) {
+                // TODO error
+                return@apiPost
+            }
+
+            VulcanHebeMessages(data, null) {
+                val message = data.messageList.firstOrNull { it.type == Message.TYPE_SENT && it.subject == subject }
+                val metadata = data.metadataList.firstOrNull { it.thingType == Metadata.TYPE_MESSAGE && it.thingId == messageId }
+                val event = MessageSentEvent(data.profileId, message, message?.addedDate)
+
+                EventBus.getDefault().postSticky(event)
+                onSuccess()
+            }.getMessages(Message.TYPE_SENT)
+        }
+    }
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/entity/Teacher.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/entity/Teacher.kt
index 27431a4f..c41b8a7a 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/entity/Teacher.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/entity/Teacher.kt
@@ -11,6 +11,7 @@ import androidx.room.Entity
 import androidx.room.Ignore
 import pl.szczodrzynski.edziennik.R
 import pl.szczodrzynski.edziennik.fixName
+import pl.szczodrzynski.edziennik.getNameInitials
 import pl.szczodrzynski.edziennik.join
 import java.util.*
 
@@ -180,6 +181,9 @@ open class Teacher {
     @delegate:Ignore
     val fullNameLastFirst by lazy { "$surname $name".fixName() }
 
+    @delegate:Ignore
+    val initialsLastFirst by lazy { fullNameLastFirst.getNameInitials() }
+
     val shortName: String
         get() = (if (name == null || name?.length == 0) "" else name!![0].toString()) + "." + surname