diff --git a/erpnext/accounts/doctype/payment_request/payment_request.py b/erpnext/accounts/doctype/payment_request/payment_request.py
index a0efac5..421bd17 100644
--- a/erpnext/accounts/doctype/payment_request/payment_request.py
+++ b/erpnext/accounts/doctype/payment_request/payment_request.py
@@ -11,6 +11,7 @@
 from erpnext.accounts.utils import get_account_currency
 from erpnext.accounts.doctype.payment_entry.payment_entry import get_payment_entry, get_company_defaults
 from frappe.integrations.utils import get_payment_gateway_controller
+from frappe.utils.background_jobs import enqueue
 
 class PaymentRequest(Document):
 	def validate(self):
@@ -142,9 +143,15 @@
 
 	def send_email(self):
 		"""send email with payment link"""
-		frappe.sendmail(recipients=self.email_to, sender=None, subject=self.subject,
-			message=self.get_message(), attachments=[frappe.attach_print(self.reference_doctype,
-			self.reference_name, file_name=self.reference_name, print_format=self.print_format)])
+		email_args = {
+			"recipients": self.email_to,
+			"sender": None,
+			"subject": self.subject,
+			"message": self.get_message(),
+			"now": True,
+			"attachments": [frappe.attach_print(self.reference_doctype, self.reference_name,
+				file_name=self.reference_name, print_format=self.print_format)]}
+		enqueue(method=frappe.sendmail, queue='short', timeout=300, async=True, **email_args)
 
 	def get_message(self):
 		"""return message with payment gateway link"""
diff --git a/erpnext/hr/doctype/salary_slip/salary_slip.py b/erpnext/hr/doctype/salary_slip/salary_slip.py
index 2bd08c2..1d17613 100644
--- a/erpnext/hr/doctype/salary_slip/salary_slip.py
+++ b/erpnext/hr/doctype/salary_slip/salary_slip.py
@@ -11,6 +11,7 @@
 from erpnext.hr.doctype.process_payroll.process_payroll import get_start_end_dates
 from erpnext.hr.doctype.employee.employee import get_holiday_list_for_employee
 from erpnext.utilities.transaction_base import TransactionBase
+from frappe.utils.background_jobs import enqueue
 
 class SalarySlip(TransactionBase):
 	def autoname(self):
@@ -396,9 +397,15 @@
 		receiver = frappe.db.get_value("Employee", self.employee, "prefered_email")
 
 		if receiver:
-			subj = 'Salary Slip - from {0} to {1}'.format(self.start_date, self.end_date)
-			frappe.sendmail([receiver], subject=subj, message = _("Please see attachment"),
-				attachments=[frappe.attach_print(self.doctype, self.name, file_name=self.name)], reference_doctype= self.doctype, reference_name= self.name)
+			email_args = {
+				"recipients": [receiver],
+				"message": _("Please see attachment"),
+				"subject": 'Salary Slip - from {0} to {1}'.format(self.start_date, self.end_date),
+				"attachments": [frappe.attach_print(self.doctype, self.name, file_name=self.name)],
+				"reference_doctype": self.doctype,
+				"reference_name": self.name
+				}
+			enqueue(method=frappe.sendmail, queue='short', timeout=300, async=True, **email_args)
 		else:
 			msgprint(_("{0}: Employee email not found, hence email not sent").format(self.employee_name))