diff --git a/backend/.env.dist b/backend/.env.dist
index 150269632..8cef61eff 100644
--- a/backend/.env.dist
+++ b/backend/.env.dist
@@ -10,6 +10,14 @@ DB_PORT=3306
 DB_USER=root
 DB_PASSWORD=
 DB_DATABASE=gradido_community
+
+#EMAIL=true
+#EMAIL_USERNAME=
+#EMAIL_SENDER=
+#EMAIL_PASSWORD=
+#EMAIL_SMTP_URL=
+#EMAIL_SMTP_PORT=587
+
 #KLICKTIPP_USER=
 #KLICKTIPP_PASSWORD=
 #KLICKTIPP_APIKEY_DE=
diff --git a/backend/package.json b/backend/package.json
index 5e3d712b3..c4fa1a695 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -29,6 +29,7 @@
     "jsonwebtoken": "^8.5.1",
     "libsodium-wrappers": "^0.7.9",
     "mysql2": "^2.3.0",
+    "nodemailer": "^6.6.5",
     "reflect-metadata": "^0.1.13",
     "ts-jest": "^27.0.5",
     "type-graphql": "^1.1.1",
diff --git a/backend/src/config/index.ts b/backend/src/config/index.ts
index 98a67864c..feff3b6c1 100644
--- a/backend/src/config/index.ts
+++ b/backend/src/config/index.ts
@@ -30,9 +30,18 @@ const klicktipp = {
   KLICKTIPP_APIKEY_EN: process.env.KLICKTIPP_APIKEY_EN || 'SomeFakeKeyEN',
 }
 
+const email = {
+  EMAIL: process.env.EMAIL === 'true' || false,
+  EMAIL_USERNAME: process.env.EMAIL_USERNAME || 'gradido_email',
+  EMAIL_SENDER: process.env.EMAIL_SENDER || 'info@gradido.net',
+  EMAIL_PASSWORD: process.env.EMAIL_PASSWORD || 'xxx',
+  EMAIL_SMTP_URL: process.env.EMAIL_SMTP_URL || 'gmail.com',
+  EMAIL_SMTP_PORT: process.env.EMAIL_SMTP_PORT || 587,
+}
+
 // This is needed by graphql-directive-auth
 process.env.APP_SECRET = server.JWT_SECRET
 
-const CONFIG = { ...server, ...database, ...klicktipp }
+const CONFIG = { ...server, ...database, ...klicktipp, ...email }
 
 export default CONFIG
diff --git a/backend/src/graphql/resolver/UserResolver.ts b/backend/src/graphql/resolver/UserResolver.ts
index 82335d10d..10f98553a 100644
--- a/backend/src/graphql/resolver/UserResolver.ts
+++ b/backend/src/graphql/resolver/UserResolver.ts
@@ -8,30 +8,22 @@ import { LoginViaVerificationCode } from '../model/LoginViaVerificationCode'
 import { SendPasswordResetEmailResponse } from '../model/SendPasswordResetEmailResponse'
 import { UpdateUserInfosResponse } from '../model/UpdateUserInfosResponse'
 import { User } from '../model/User'
-import {
-  UserSettingRepository,
-  UserSettingRepository,
-  UserSettingRepository,
-} from '../../typeorm/repository/UserSettingRepository'
+import { UserSettingRepository } from '../../typeorm/repository/UserSettingRepository'
 import encode from '../../jwt/encode'
-import ChangePasswordArgs from '../arg/ChangePasswordArgs'
-import { Setting } from '../../types'
-import {
-  ChangePasswordArgs,
-  CheckUsernameArgs,
-  CreateUserArgs,
-  UnsecureLoginArgs,
-  UpdateUserInfosArgs,
-} from '../inputs/LoginUserInput'
 import { apiPost, apiGet } from '../../apis/HttpRequest'
 import {
   klicktippRegistrationMiddleware,
   klicktippNewsletterStateMiddleware,
 } from '../../middleware/klicktippMiddleware'
 import { CheckEmailResponse } from '../model/CheckEmailResponse'
-import { getCustomRepository, getCustomRepository, getCustomRepository } from 'typeorm'
+import { getCustomRepository } from 'typeorm'
 import { Setting } from '../enum/Setting'
 import { UserRepository } from '../../typeorm/repository/User'
+import UnsecureLoginArgs from '../arg/UnsecureLoginArgs'
+import CreateUserArgs from '../arg/CreateUserArgs'
+import ChangePasswordArgs from '../arg/ChangePasswordArgs'
+import UpdateUserInfosArgs from '../arg/UpdateUserInfosArgs'
+import CheckUsernameArgs from '../arg/CheckUsernameArgs'
 
 @Resolver()
 export class UserResolver {
diff --git a/backend/src/typeorm/entity/TransactionSignature.ts b/backend/src/typeorm/entity/TransactionSignature.ts
new file mode 100644
index 000000000..df3e02ba6
--- /dev/null
+++ b/backend/src/typeorm/entity/TransactionSignature.ts
@@ -0,0 +1,21 @@
+import { BaseEntity, Entity, PrimaryGeneratedColumn, Column, ManyToOne, JoinColumn } from 'typeorm'
+import { Transaction } from './Transaction'
+
+@Entity('transaction_signatures')
+export class TransactionSignature extends BaseEntity {
+  @PrimaryGeneratedColumn()
+  id: number
+
+  @Column({ name: 'transaction_id' })
+  transactionId: number
+
+  @Column({ type: 'binary', length: 64 })
+  signature: Buffer
+
+  @Column({ type: 'binary', length: 32 })
+  pubkey: Buffer
+
+  @ManyToOne(() => Transaction)
+  @JoinColumn({ name: 'transaction_id' })
+  transaction: Transaction
+}