diff --git a/src/__tests__/utils/helpers.test.tsx b/src/__tests__/utils/helpers.test.tsx
index 3f82652..127402d 100644
--- a/src/__tests__/utils/helpers.test.tsx
+++ b/src/__tests__/utils/helpers.test.tsx
@@ -1,6 +1,8 @@
 import Transaction from '../../models/Transaction';
 import {
   canProcessSloCode,
+  checkDomainValue,
+  checkEmailValue,
   extractParamsFromUri,
   logOutBody,
   prepareConfig,
@@ -316,3 +318,80 @@ describe('helpers#canProcessSloCode/2', () => {
     ).toBeTruthy();
   });
 });
+
+describe('helper#checkEmaiValue/1', () => {
+  it('returns false if empty string value', () => {
+    expect(() => checkEmailValue('')).toThrowError(
+      'Please provide non blank string for email'
+    );
+  });
+  it('returns false if wrong string value', () => {
+    expect(() => checkEmailValue('azerty')).toThrowError(
+      'Please provide valid email'
+    );
+  });
+
+  it('returns false if @ string value', () => {
+    expect(() => checkEmailValue('@')).toThrowError(
+      'Please provide valid email'
+    );
+  });
+
+  it('returns true if simple string value', () => {
+    expect(checkEmailValue('john@example.com')).toEqual('john@example.com');
+  });
+
+  it('returns true if dotted email string value', () => {
+    expect(checkEmailValue('john.doe@example.com')).toEqual(
+      'john.doe@example.com'
+    );
+  });
+
+  it('returns false if ending first part with dots email string value', () => {
+    expect(() => checkEmailValue('wrong..@example.com')).toThrowError(
+      'Please provide valid email'
+    );
+  });
+
+  it('returns false if alias email string value', () => {
+    expect(() => checkEmailValue('john+alias@example.com')).toThrowError(
+      'Please provide valid email'
+    );
+  });
+
+  it('returns truthy if tiret email string value', () => {
+    expect(checkEmailValue('john-doe@example.com')).toEqual(
+      'john-doe@example.com'
+    );
+  });
+
+  it('returns truthy if underscored email string value', () => {
+    expect(checkEmailValue('john-doe@example.com')).toEqual(
+      'john-doe@example.com'
+    );
+  });
+});
+
+describe('helpers#checkDomainValue/1', () => {
+  it('should throw error if empy input', () => {
+    expect(() => checkDomainValue(' ')).toThrowError(
+      'Please provide non blank string for domain'
+    );
+  });
+
+  it('should throw error if underscored input', () => {
+    expect(() => checkDomainValue('_')).toThrowError(
+      'Please provide valid domain (alphanumeric dashed separated)'
+    );
+  });
+
+  it('should throw error if standard account complex name input', () => {
+    expect(() => checkDomainValue("My awesome Company's name")).toThrowError(
+      'Please provide valid domain (alphanumeric dashed separated)'
+    );
+  });
+
+  it('should return value if proper domain input', () => {
+    expect(checkDomainValue('communitiz-app')).toEqual('communitiz-app');
+  });
+});
diff --git a/src/components/CryptrGatewayButton.tsx b/src/components/CryptrGatewayButton.tsx
index d4fb07d..2990880 100644
--- a/src/components/CryptrGatewayButton.tsx
+++ b/src/components/CryptrGatewayButton.tsx
@@ -3,26 +3,7 @@ import { Locale, useCryptr } from '..';
 import { Pressable, Text, View } from 'react-native';
 import type { StyleProp, TextStyle, ViewStyle } from 'react-native';
 import { defaultStyles } from '../utils/defaultStypes';
-
-const checkEmailValue = (emailValue: string) => {
-  if (emailValue.trim() === '') {
-    throw new Error('Please provide non blank string for email');
-  }
-  if (!/^[a-zA-Z0-9+]+@(?:[a-zA-Z0-9-]+\.)+[A-Za-z]+$/.test(emailValue)) {
-    throw new Error('Please provide valid email');
-  }
-  return emailValue;
-};
-
-const checkDomainValue = (domainValue?: string) => {
-  if (domainValue !== undefined && domainValue?.trim() !== '') {
-    if (!/^[a-z0-9-]*$/.test(domainValue)) {
-      throw new Error(
-        'Please provide valid domain (alphanumeric dashed separated)'
-      );
-    }
-  }
-};
+import { checkDomainValue, checkEmailValue } from '../utils/helpers';
 
 type GatewayProps = {
   domain?: string;
diff --git a/src/utils/helpers.tsx b/src/utils/helpers.tsx
index 6fe1104..0ef9e8b 100644
--- a/src/utils/helpers.tsx
+++ b/src/utils/helpers.tsx
@@ -157,3 +157,27 @@ export const canProcessSloCode = (
     // ips !== 'google'
   );
 };
+
+export const checkEmailValue = (emailValue: string) => {
+  if (emailValue.trim() === '') {
+    throw new Error('Please provide non blank string for email');
+  }
+  if (
+    !/^[a-z0-9]+[-_.]?[a-z0-9]+@(?:[a-zA-Z0-9-]+\.)+[A-Za-z]+$/.test(emailValue)
+  ) {
+    throw new Error('Please provide valid email');
+  }
+  return emailValue;
+};
+
+export const checkDomainValue = (domainValue?: string) => {
+  if (domainValue === undefined || domainValue.trim() === '') {
+    throw new Error('Please provide non blank string for domain');
+  }
+  if (!/^[a-z0-9-]*$/.test(domainValue)) {
+    throw new Error(
+      'Please provide valid domain (alphanumeric dashed separated)'
+    );
+  }
+  return domainValue;
+};