diff --git a/frontend/package.json b/frontend/package.json
index 7d89fba7c..fb9b4885f 100755
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -50,6 +50,7 @@
     "prettier": "^2.2.1",
     "qrcanvas-vue": "2.1.1",
     "regenerator-runtime": "^0.13.7",
+    "uuid": "^9.0.0",
     "vee-validate": "^3.4.5",
     "vue": "2.6.12",
     "vue-apollo": "^3.0.7",
diff --git a/frontend/src/components/GddSend/TransactionForm.vue b/frontend/src/components/GddSend/TransactionForm.vue
index e887c47e6..41fb400e7 100644
--- a/frontend/src/components/GddSend/TransactionForm.vue
+++ b/frontend/src/components/GddSend/TransactionForm.vue
@@ -51,10 +51,10 @@
                   <b-row>
                     <b-col cols="12" v-if="radioSelected === sendTypes.send">
                       <div v-if="!gradidoID">
-                        <input-email
+                        <input-identifier
                           :name="$t('form.recipient')"
                           :label="$t('form.recipient')"
-                          :placeholder="$t('form.email')"
+                          :placeholder="$t('form.identifier')"
                           v-model="form.identifier"
                           :disabled="isBalanceDisabled"
                           @onValidation="onValidation"
@@ -125,108 +125,108 @@
   </div>
 </template>
 <script>
-import { SEND_TYPES } from '@/pages/Send'
-import InputEmail from '@/components/Inputs/InputEmail'
-import InputAmount from '@/components/Inputs/InputAmount'
-import InputTextarea from '@/components/Inputs/InputTextarea'
-import { user as userQuery } from '@/graphql/queries'
-import { isEmpty } from 'lodash'
+ import { SEND_TYPES } from '@/pages/Send'
+ import InputIdentifier from '@/components/Inputs/InputIdentifier'
+ import InputAmount from '@/components/Inputs/InputAmount'
+ import InputTextarea from '@/components/Inputs/InputTextarea'
+ import { user as userQuery } from '@/graphql/queries'
+ import { isEmpty } from 'lodash'
 
-export default {
-  name: 'TransactionForm',
-  components: {
-    InputEmail,
-    InputAmount,
-    InputTextarea,
-  },
-  props: {
-    balance: { type: Number, default: 0 },
-    identifier: { type: String, default: '' },
-    amount: { type: Number, default: 0 },
-    memo: { type: String, default: '' },
-    selected: { type: String, default: 'send' },
-  },
-  data() {
-    return {
-      form: {
-        identifier: this.identifier,
-        amount: this.amount ? String(this.amount) : '',
-        memo: this.memo,
-      },
-      radioSelected: this.selected,
-      userName: '',
-    }
-  },
-  methods: {
-    onValidation() {
-      this.$refs.formValidator.validate()
-    },
-    onSubmit() {
-      if (this.gradidoID) this.form.identifier = this.gradidoID
-      this.$emit('set-transaction', {
-        selected: this.radioSelected,
-        identifier: this.form.identifier,
-        amount: Number(this.form.amount.replace(',', '.')),
-        memo: this.form.memo,
-        userName: this.userName,
-      })
-    },
-    onReset(event) {
-      event.preventDefault()
-      this.form.identifier = ''
-      this.form.amount = ''
-      this.form.memo = ''
-      this.$refs.formValidator.validate()
-      if (this.$route.query && !isEmpty(this.$route.query))
-        this.$router.replace({ query: undefined })
-    },
-  },
-  apollo: {
-    UserName: {
-      query() {
-        return userQuery
-      },
-      fetchPolicy: 'network-only',
-      variables() {
-        return { identifier: this.gradidoID }
-      },
-      skip() {
-        return !this.gradidoID
-      },
-      update({ user }) {
-        this.userName = `${user.firstName} ${user.lastName}`
-      },
-      error({ message }) {
-        this.toastError(message)
-      },
-    },
-  },
-  computed: {
-    disabled() {
-      if (
-        this.form.identifier.length > 5 &&
-        parseInt(this.form.amount) <= parseInt(this.balance) &&
-        this.form.memo.length > 5 &&
-        this.form.memo.length <= 255
-      ) {
-        return false
-      }
-      return true
-    },
-    isBalanceDisabled() {
-      return this.balance <= 0 ? 'disabled' : false
-    },
-    sendTypes() {
-      return SEND_TYPES
-    },
-    gradidoID() {
-      return this.$route.query && this.$route.query.gradidoID
-    },
-  },
-  mounted() {
-    if (this.form.identifier !== '') this.$refs.formValidator.validate()
-  },
-}
+ export default {
+   name: 'TransactionForm',
+   components: {
+     InputIdentifier,
+     InputAmount,
+     InputTextarea,
+   },
+   props: {
+     balance: { type: Number, default: 0 },
+     identifier: { type: String, default: '' },
+     amount: { type: Number, default: 0 },
+     memo: { type: String, default: '' },
+     selected: { type: String, default: 'send' },
+   },
+   data() {
+     return {
+       form: {
+         identifier: this.identifier,
+         amount: this.amount ? String(this.amount) : '',
+         memo: this.memo,
+       },
+       radioSelected: this.selected,
+       userName: '',
+     }
+   },
+   methods: {
+     onValidation() {
+       this.$refs.formValidator.validate()
+     },
+     onSubmit() {
+       if (this.gradidoID) this.form.identifier = this.gradidoID
+       this.$emit('set-transaction', {
+         selected: this.radioSelected,
+         identifier: this.form.identifier,
+         amount: Number(this.form.amount.replace(',', '.')),
+         memo: this.form.memo,
+         userName: this.userName,
+       })
+     },
+     onReset(event) {
+       event.preventDefault()
+       this.form.identifier = ''
+       this.form.amount = ''
+       this.form.memo = ''
+       this.$refs.formValidator.validate()
+       if (this.$route.query && !isEmpty(this.$route.query))
+         this.$router.replace({ query: undefined })
+     },
+   },
+   apollo: {
+     UserName: {
+       query() {
+         return userQuery
+       },
+       fetchPolicy: 'network-only',
+       variables() {
+         return { identifier: this.gradidoID }
+       },
+       skip() {
+         return !this.gradidoID
+       },
+       update({ user }) {
+         this.userName = `${user.firstName} ${user.lastName}`
+       },
+       error({ message }) {
+         this.toastError(message)
+       },
+     },
+   },
+   computed: {
+     disabled() {
+       if (
+         this.form.identifier.length > 5 &&
+         parseInt(this.form.amount) <= parseInt(this.balance) &&
+         this.form.memo.length > 5 &&
+         this.form.memo.length <= 255
+       ) {
+         return false
+       }
+       return true
+     },
+     isBalanceDisabled() {
+       return this.balance <= 0 ? 'disabled' : false
+     },
+     sendTypes() {
+       return SEND_TYPES
+     },
+     gradidoID() {
+       return this.$route.query && this.$route.query.gradidoID
+     },
+   },
+   mounted() {
+     if (this.form.identifier !== '') this.$refs.formValidator.validate()
+   },
+ }
 </script>
 <style>
 span.errors {
diff --git a/frontend/src/components/Inputs/InputIdentifier.vue b/frontend/src/components/Inputs/InputIdentifier.vue
new file mode 100644
index 000000000..84ed9eaee
--- /dev/null
+++ b/frontend/src/components/Inputs/InputIdentifier.vue
@@ -0,0 +1,69 @@
+<template>
+  <validation-provider
+    tag="div"
+    :rules="rules"
+    :name="name"
+    v-slot="{ errors, valid, validated, ariaInput, ariaMsg }"
+  >
+    <b-form-group :label="label" :label-for="labelFor" data-test="input-email">
+      <b-form-input
+        v-model="currentValue"
+        v-bind="ariaInput"
+        data-test="input-identifier"
+        :id="labelFor"
+        :name="name"
+        :placeholder="placeholder"
+        type="text"
+        :state="validated ? valid : false"
+        trim
+        class="bg-248"
+        :disabled="disabled"
+        autocomplete="off"
+      ></b-form-input>
+      <b-form-invalid-feedback v-bind="ariaMsg">
+        {{ errors[0] }}
+      </b-form-invalid-feedback>
+    </b-form-group>
+  </validation-provider>
+</template>
+<script>
+ export default {
+   name: 'InputEmail',
+   props: {
+     rules: {
+       default: () => {
+         return {
+           required: true,
+           validIdentifier: true,
+         }
+       },
+     },
+     name: { type: String, required: true },
+     label: { type: String, required: true },
+     placeholder: { type: String, required: true },
+     value: { type: String, required: true },
+     disabled: { type: Boolean, required: false, default: false },
+   },
+   data() {
+     return {
+       currentValue: this.value,
+     }
+   },
+   computed: {
+     labelFor() {
+       return this.name + '-input-field'
+     },
+   },
+   watch: {
+     currentValue() {
+       this.$emit('input', this.currentValue)
+     },
+     value() {
+       if (this.value !== this.currentValue) {
+         this.currentValue = this.value
+       }
+       this.$emit('onValidation')
+     },
+   },
+ }
+</script>
diff --git a/frontend/src/locales/de.json b/frontend/src/locales/de.json
index c571fa0c2..d05253ce8 100644
--- a/frontend/src/locales/de.json
+++ b/frontend/src/locales/de.json
@@ -142,6 +142,7 @@
     "from": "Von",
     "generate_now": "Jetzt generieren",
     "hours": "Stunden",
+    "identifier": "Email, Nutzername oder Gradido ID",
     "lastname": "Nachname",
     "memo": "Nachricht",
     "message": "Nachricht",
@@ -174,7 +175,8 @@
       "is-not": "Du kannst dir selbst keine Gradidos überweisen",
       "username-allowed-chars": "Der Nutzername darf nur aus Buchstaben (ohne Umlaute), Zahlen, Binde- oder Unterstrichen bestehen.",
       "username-hyphens": "Binde- oder Unterstriche müssen zwischen Buchstaben oder Zahlen stehen.",
-      "username-unique": "Der Nutzername ist bereits vergeben."
+      "username-unique": "Der Nutzername ist bereits vergeben.",
+      "valid-identifier": "Muss eine Email, ein Nutzernamen oder eine gradido ID sein."
     },
     "your_amount": "Dein Betrag"
   },
diff --git a/frontend/src/locales/en.json b/frontend/src/locales/en.json
index 806e2a5e1..bec3055db 100644
--- a/frontend/src/locales/en.json
+++ b/frontend/src/locales/en.json
@@ -142,6 +142,7 @@
     "from": "from",
     "generate_now": "Generate now",
     "hours": "Hours",
+    "identifier": "Email, username or gradido ID",
     "lastname": "Lastname",
     "memo": "Message",
     "message": "Message",
@@ -174,7 +175,8 @@
       "is-not": "You cannot send Gradidos to yourself",
       "username-allowed-chars": "The username may contain letters, numbers, hyphens or underscores.",
       "username-hyphens": "Hyphens or underscores must be in between letters or numbers.",
-      "username-unique": "This username is already taken."
+      "username-unique": "This username is already taken.",
+      "valid-identifier": "Must be a valid email, username or gradido ID."
     },
     "your_amount": "Your amount"
   },
diff --git a/frontend/src/validation-rules.js b/frontend/src/validation-rules.js
index 53b301676..d0bec1ac9 100644
--- a/frontend/src/validation-rules.js
+++ b/frontend/src/validation-rules.js
@@ -2,6 +2,12 @@ import { configure, extend } from 'vee-validate'
 // eslint-disable-next-line camelcase
 import { required, email, min, max, is_not } from 'vee-validate/dist/rules'
 import { checkUsername } from '@/graphql/queries'
+import { validate as validateUuid, version as versionUuid } from 'uuid'
+
+// taken from vee-validate
+const emailRegex = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
+
+const usernameRegex = /^(?=.{3,20}$)[a-zA-Z0-9]+(?:[_-][a-zA-Z0-9])*$/
 
 export const loadAllRules = (i18nCallback, apollo) => {
   configure({
@@ -158,4 +164,14 @@ export const loadAllRules = (i18nCallback, apollo) => {
     },
     message: (_, values) => i18nCallback.t('form.validation.username-unique', values),
   })
+
+  extend('validIdentifier', {
+    validate(value) {
+      const isEmail = !!value.match(emailRegex)
+      const isUsername = !!value.match(usernameRegex)
+      // const isGradidoId = validateUuid(value) && versionUuid(value) === 4
+      return isEmail || isUsername // || isGradidoId
+    },
+    message: (_, values) => i18nCallback.t('form.validation.valid-identifier', values),
+  })
 }
diff --git a/frontend/yarn.lock b/frontend/yarn.lock
index 7cc8e5fe5..8eff12aaf 100644
--- a/frontend/yarn.lock
+++ b/frontend/yarn.lock
@@ -14176,6 +14176,11 @@ uuid@^8.3.0:
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-8.3.2.tgz#80d5b5ced271bb9af6c445f21a1a04c606cefbe2"
   integrity sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==
 
+uuid@^9.0.0:
+  version "9.0.0"
+  resolved "https://registry.yarnpkg.com/uuid/-/uuid-9.0.0.tgz#592f550650024a38ceb0c562f2f6aa435761efb5"
+  integrity sha512-MXcSTerfPa4uqyzStbRoTgt5XIe3x5+42+q1sDuy3R5MDk66URdLMOZe5aPX/SQd+kuYAh0FdP/pO28IkQyTeg==
+
 v8-compile-cache@^2.0.3, v8-compile-cache@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz#2de19618c66dc247dcfb6f99338035d8245a2cee"