diff --git a/packages/server/src/api/controllers/Sales/SalesInvoices.ts b/packages/server/src/api/controllers/Sales/SalesInvoices.ts
index 91c370273..69be4f4a8 100644
--- a/packages/server/src/api/controllers/Sales/SalesInvoices.ts
+++ b/packages/server/src/api/controllers/Sales/SalesInvoices.ts
@@ -10,6 +10,7 @@ import {
   ISaleInvoiceCreateDTO,
   SaleInvoiceAction,
   AbilitySubject,
+  SendInvoiceMailDTO,
 } from '@/interfaces';
 import CheckPolicies from '@/api/middleware/CheckPolicies';
 import { SaleInvoiceApplication } from '@/services/Sales/Invoices/SaleInvoicesApplication';
@@ -169,10 +170,10 @@ export default class SaleInvoicesController extends BaseController {
       '/:id/mail',
       [
         ...this.specificSaleInvoiceValidation,
-        body('from').isString().exists(),
-        body('to').isString().exists(),
-        body('body').isString().exists(),
-        body('attach_invoice').exists().isBoolean().toBoolean(),
+        body('from').isString().optional(),
+        body('to').isString().optional(),
+        body('body').isString().optional(),
+        body('attach_invoice').optional().isBoolean().toBoolean(),
       ],
       this.validationResult,
       asyncMiddleware(this.sendSaleInvoiceMail.bind(this)),
@@ -664,7 +665,7 @@ export default class SaleInvoicesController extends BaseController {
   };
 
   /**
-   *
+   * Sends mail invoice of the given sale invoice.
    * @param {Request} req
    * @param {Response} res
    * @param {NextFunction} next
@@ -676,11 +677,13 @@ export default class SaleInvoicesController extends BaseController {
   ) {
     const { tenantId } = req;
     const { id: invoiceId } = req.params;
+    const invoiceMailDTO: SendInvoiceMailDTO = this.matchedBodyData(req);
 
     try {
       await this.saleInvoiceApplication.sendSaleInvoiceMail(
         tenantId,
-        invoiceId
+        invoiceId,
+        invoiceMailDTO
       );
       return res.status(200).send({});
     } catch (error) {
@@ -726,11 +729,13 @@ export default class SaleInvoicesController extends BaseController {
   ) {
     const { tenantId } = req;
     const { id: invoiceId } = req.params;
+    const invoiceMailDTO: SendInvoiceMailDTO = this.matchedBodyData(req);
 
     try {
       await this.saleInvoiceApplication.sendSaleInvoiceMailReminder(
         tenantId,
-        invoiceId
+        invoiceId,
+        invoiceMailDTO
       );
       return res.status(200).send({});
     } catch (error) {
diff --git a/packages/server/src/interfaces/SaleInvoice.ts b/packages/server/src/interfaces/SaleInvoice.ts
index 59090cd03..7d7633b87 100644
--- a/packages/server/src/interfaces/SaleInvoice.ts
+++ b/packages/server/src/interfaces/SaleInvoice.ts
@@ -194,3 +194,9 @@ export interface SendInvoiceMailDTO {
   body: string;
   attachInvoice?: boolean;
 }
+
+export interface ISaleInvoiceNotifyPayload {
+  tenantId: number;
+  saleInvoiceId: number;
+  messageDTO: SendInvoiceMailDTO;
+}
diff --git a/packages/server/src/loaders/jobs.ts b/packages/server/src/loaders/jobs.ts
index 4fa3aadb1..9beb7a2bc 100644
--- a/packages/server/src/loaders/jobs.ts
+++ b/packages/server/src/loaders/jobs.ts
@@ -5,6 +5,8 @@ import RewriteInvoicesJournalEntries from 'jobs/WriteInvoicesJEntries';
 import UserInviteMailJob from 'jobs/UserInviteMail';
 import OrganizationSetupJob from 'jobs/OrganizationSetup';
 import OrganizationUpgrade from 'jobs/OrganizationUpgrade';
+import { SendSaleInvoiceMailJob } from '@/services/Sales/Invoices/SendSaleInvoiceMailJob';
+import { SendSaleInvoiceReminderMailJob } from '@/services/Sales/Invoices/SendSaleInvoiceMailReminderJob';
 
 export default ({ agenda }: { agenda: Agenda }) => {
   new ResetPasswordMailJob(agenda);
@@ -13,6 +15,8 @@ export default ({ agenda }: { agenda: Agenda }) => {
   new RewriteInvoicesJournalEntries(agenda);
   new OrganizationSetupJob(agenda);
   new OrganizationUpgrade(agenda);
+  new SendSaleInvoiceMailJob(agenda);
+  new SendSaleInvoiceReminderMailJob(agenda);
 
   agenda.start();
 };
diff --git a/packages/server/src/services/Sales/Invoices/SaleInvoicesApplication.ts b/packages/server/src/services/Sales/Invoices/SaleInvoicesApplication.ts
index eb1a475aa..9ce79b656 100644
--- a/packages/server/src/services/Sales/Invoices/SaleInvoicesApplication.ts
+++ b/packages/server/src/services/Sales/Invoices/SaleInvoicesApplication.ts
@@ -312,15 +312,20 @@ export class SaleInvoiceApplication {
    * @param {number} saleInvoiceId
    * @returns {}
    */
-  public sendSaleInvoiceMailReminder(tenantId: number, saleInvoiceId: number) {
-    return this.sendInvoiceReminderService.sendInvoiceMailReminder(
+  public sendSaleInvoiceMailReminder(
+    tenantId: number,
+    saleInvoiceId: number,
+    messageDTO: SendInvoiceMailDTO
+  ) {
+    return this.sendInvoiceReminderService.triggerMail(
       tenantId,
-      saleInvoiceId
+      saleInvoiceId,
+      messageDTO
     );
   }
 
   /**
-   *
+   * Sends the invoice mail of the given sale invoice.
    * @param {number} tenantId
    * @param {number} saleInvoiceId
    * @param {SendInvoiceMailDTO} messageDTO
@@ -331,7 +336,7 @@ export class SaleInvoiceApplication {
     saleInvoiceId: number,
     messageDTO: SendInvoiceMailDTO
   ) {
-    return this.sendSaleInvoiceMailService.sendSaleInvoiceMail(
+    return this.sendSaleInvoiceMailService.sendMail(
       tenantId,
       saleInvoiceId,
       messageDTO
diff --git a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMail.ts b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMail.ts
index 7d0b89b86..0fa1aeded 100644
--- a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMail.ts
+++ b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMail.ts
@@ -1,12 +1,67 @@
-import { Service } from 'typedi';
-import { SendInvoiceMailDTO } from '@/interfaces';
-
+import { Inject, Service } from 'typedi';
+import { ISaleInvoiceNotifyPayload, SendInvoiceMailDTO } from '@/interfaces';
+import Mail from '@/lib/Mail';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
+import events from '@/subscribers/events';
+import { EventPublisher } from '@/lib/EventPublisher/EventPublisher';
 
 @Service()
 export class SendSaleInvoiceMail {
-  public sendSaleInvoiceMail(
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  @Inject('agenda')
+  private agenda: any;
+
+  /**
+   * Sends the invoice mail of the given sale invoice.
+   * @param {number} tenantId
+   * @param {number} saleInvoiceId
+   * @param {SendInvoiceMailDTO} messageDTO
+   */
+  public async sendMail(
     tenantId: number,
     saleInvoiceId: number,
     messageDTO: SendInvoiceMailDTO
-  ) {}
+  ) {
+    const payload = {
+      tenantId,
+      saleInvoiceId,
+      messageDTO,
+    };
+    await this.agenda.now('sale-invoice-mail-send', payload);
+  }
+
+  /**
+   * Triggers the mail invoice.
+   * @param {number} tenantId
+   * @param {number} saleInvoiceId
+   * @param {SendInvoiceMailDTO} messageDTO
+   * @returns {Promise<void>}
+   */
+  public async triggerMail(
+    tenantId: number,
+    saleInvoiceId: number,
+    messageDTO: SendInvoiceMailDTO
+  ) {
+    const { SaleInvoice } = this.tenancy.models(tenantId);
+
+    const saleInvoice = await SaleInvoice.query()
+      .findById(saleInvoiceId)
+      .withGraphFetched('customer');
+
+    const toEmail = messageDTO.to || saleInvoice.customer.email;
+    const subject = messageDTO.subject || saleInvoice.invoiceNo;
+
+    if (!toEmail) {
+      return null;
+    }
+    const mail = new Mail()
+      .setSubject(subject)
+      .setView('mail/UserInvite.html')
+      .setTo(toEmail)
+      .setData({});
+
+    await mail.send();
+  }
 }
diff --git a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailJob.ts b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailJob.ts
new file mode 100644
index 000000000..2b73757f3
--- /dev/null
+++ b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailJob.ts
@@ -0,0 +1,33 @@
+import Container, { Service } from 'typedi';
+import events from '@/subscribers/events';
+import { SendSaleInvoiceMail } from './SendSaleInvoiceMail';
+
+@Service()
+export class SendSaleInvoiceMailJob {
+  /**
+   * Constructor method.
+   */
+  constructor(agenda) {
+    agenda.define(
+      'sale-invoice-mail-send',
+      { priority: 'high', concurrency: 1 },
+      this.handler
+    );
+  }
+
+  /**
+   * Triggers sending invoice mail.
+   */
+  private handler = async (job, done: Function) => {
+    const { tenantId, saleInvoiceId, messageDTO } = job.attrs.data;
+    const sendInvoiceMail = Container.get(SendSaleInvoiceMail);
+
+    try {
+      await sendInvoiceMail.triggerMail(tenantId, saleInvoiceId, messageDTO);
+      done();
+    } catch (error) {
+      console.log(error);
+      done(error);
+    }
+  };
+}
diff --git a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminder.ts b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminder.ts
index 6dcf49693..da210cf41 100644
--- a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminder.ts
+++ b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminder.ts
@@ -1,11 +1,64 @@
-import { Service } from 'typedi';
+import { Inject, Service } from 'typedi';
+import { SendInvoiceMailDTO } from '@/interfaces';
+import Mail from '@/lib/Mail';
+import HasTenancyService from '@/services/Tenancy/TenancyService';
 
 @Service()
 export class SendInvoiceMailReminder {
+  @Inject()
+  private tenancy: HasTenancyService;
+
+  @Inject('agenda')
+  private agenda: any;
+
   /**
-   *
+   * Triggers the reminder mail of the given sale invoice.
    * @param {number} tenantId
    * @param {number} saleInvoiceId
    */
-  public sendInvoiceMailReminder(tenantId: number, saleInvoiceId: number) {}
+  public async triggerMail(
+    tenantId: number,
+    saleInvoiceId: number,
+    messageDTO: SendInvoiceMailDTO
+  ) {
+    const payload = {
+      tenantId,
+      saleInvoiceId,
+      messageDTO,
+    };
+    await this.agenda.now('sale-invoice-reminder-mail-send', payload);
+  }
+
+  /**
+   * Triggers the mail invoice.
+   * @param {number} tenantId
+   * @param {number} saleInvoiceId
+   * @param {SendInvoiceMailDTO} messageDTO
+   * @returns {Promise<void>}
+   */
+  public async sendMail(
+    tenantId: number,
+    saleInvoiceId: number,
+    messageDTO: SendInvoiceMailDTO
+  ) {
+    const { SaleInvoice } = this.tenancy.models(tenantId);
+
+    const saleInvoice = await SaleInvoice.query()
+      .findById(saleInvoiceId)
+      .withGraphFetched('customer');
+
+    const toEmail = messageDTO.to || saleInvoice.customer.email;
+    const subject = messageDTO.subject || saleInvoice.invoiceNo;
+
+    if (!toEmail) {
+      return null;
+    }
+    const mail = new Mail()
+      .setSubject(subject)
+      .setView('mail/UserInvite.html')
+      .setTo(toEmail)
+      .setData({});
+
+    await mail.send();
+  }
 }
diff --git a/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminderJob.ts b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminderJob.ts
new file mode 100644
index 000000000..97a622c7d
--- /dev/null
+++ b/packages/server/src/services/Sales/Invoices/SendSaleInvoiceMailReminderJob.ts
@@ -0,0 +1,32 @@
+import Container, { Service } from 'typedi';
+import { SendInvoiceMailReminder } from './SendSaleInvoiceMailReminder';
+
+@Service()
+export class SendSaleInvoiceReminderMailJob {
+  /**
+   * Constructor method.
+   */
+  constructor(agenda) {
+    agenda.define(
+      'sale-invoice-reminder-mail-send',
+      { priority: 'high', concurrency: 1 },
+      this.handler
+    );
+  }
+
+  /**
+   * Triggers sending invoice mail.
+   */
+  private handler = async (job, done: Function) => {
+    const { tenantId, saleInvoiceId, messageDTO } = job.attrs.data;
+    const sendInvoiceMail = Container.get(SendInvoiceMailReminder);
+
+    try {
+      await sendInvoiceMail.sendMail(tenantId, saleInvoiceId, messageDTO);
+      done();
+    } catch (error) {
+      console.log(error);
+      done(error);
+    }
+  };
+}
diff --git a/packages/server/src/subscribers/events.ts b/packages/server/src/subscribers/events.ts
index 24ca0a0a3..e54f48152 100644
--- a/packages/server/src/subscribers/events.ts
+++ b/packages/server/src/subscribers/events.ts
@@ -129,6 +129,9 @@ export default {
 
     onNotifySms: 'onSaleInvoiceNotifySms',
     onNotifiedSms: 'onSaleInvoiceNotifiedSms',
+
+    onNotifyMail: 'onSaleInvoiceNotifyMail',
+    onNotifyReminderMail: 'onSaleInvoiceNotifyReminderMail'
   },
 
   /**
@@ -160,6 +163,8 @@ export default {
 
     onRejecting: 'onSaleEstimateRejecting',
     onRejected: 'onSaleEstimateRejected',
+
+    onNotifyMail: 'onSaleEstimateNotifyMail'
   },
 
   /**