Excel Email Macro VBA - How to send an email once all required fields have been fille

Im a beginner to Excel VBA Code but here's what Ive got so far:

- Ive created a form that I want customers to fill out
- Some fields have been coded as mandatory
- The form can then be submitted by email straight to me by clicking on a button at the bottom of the form
- I want the submit button to check all required fields have been completed before submitting the form
- The below code already pops up an info box stating 'You must complete field X' if it is blank
- The code also sends the email when all fields are completed.

HOWEVER...

If there is data missing from one of the required fields it still sends the email anyway rather than pausing at each missed point and allowing the user to fill in the data and then continuing to check the rest of the form - I wish this process to be looped until all fields required are completed - and only then should the email feature activate.

Bacially an If/Then function to state - 'If all required fields complete Then Send email'

I hope this made sense...

Sub SendIt()

If [D17].Value = "" Then
MsgBox "There MUST be an entry in Full Name!", vbOKOnly, "Entry Reqd"
[D17].Select
Cancel = True
End If

If [D18].Value = "" Then
MsgBox "There MUST be an entry in Contact Number!", vbOKOnly, "Entry Reqd"
[D18].Select
Cancel = True
End If

If [D19].Value = "" Then
MsgBox "There MUST be an entry in Contact Email!", vbOKOnly, "Entry Reqd"
[D19].Select
Cancel = True
End If

If [D24].Value = "" Then
MsgBox "There MUST be an entry in Date of Change!", vbOKOnly, "Entry Reqd"
[D24].Select
Cancel = True
End If

If [D27].Value = "" Then
MsgBox "There MUST be an entry in Building Number/Name!", vbOKOnly, "Entry Reqd"
[D27].Select
Cancel = True
End If

If [D28].Value = "" Then
MsgBox "There MUST be an entry in Address Line 1!", vbOKOnly, "Entry Reqd"
[D28].Select
Cancel = True
End If

If [D29].Value = "" Then
MsgBox "There MUST be an entry in Address Line 2!", vbOKOnly, "Entry Reqd"
[D29].Select
Cancel = True
End If

If [D30].Value = "" Then
MsgBox "There MUST be an entry in Town/City!", vbOKOnly, "Entry Reqd"
[D30].Select
Cancel = True
End If

If [D32].Value = "" Then
MsgBox "There MUST be an entry in Postcode!", vbOKOnly, "Entry Reqd"
[D32].Select
Cancel = True
End If

If [D36].Value = "" Then
MsgBox "There MUST be an entry in Previous Tenant/Owner!", vbOKOnly, "Entry Reqd"
[D36].Select
Cancel = True
End If

If [D39].Value = "" Then
MsgBox "There MUST be an entry in Forwarding Address!", vbOKOnly, "Entry Reqd"
[D39].Select
Cancel = True
End If

If [D43].Value = "" Then
MsgBox "There MUST be an entry in Contact Name!", vbOKOnly, "Entry Reqd"
[D43].Select
Cancel = True
End If

If [D44].Value = "" Then
MsgBox "There MUST be an entry in Contact Number!", vbOKOnly, "Entry Reqd"
[D44].Select
Cancel = True
End If

If [D47].Value = "" Then
MsgBox "There MUST be an entry in New Tenant/Owner!", vbOKOnly, "Entry Reqd"
[D47].Select
Cancel = True
End If

If [D50].Value = "" Then
MsgBox "There MUST be an entry in Billing Address!", vbOKOnly, "Entry Reqd"
[D50].Select
Cancel = True
End If

If [D54].Value = "" Then
MsgBox "There MUST be an entry in Contact Name!", vbOKOnly, "Entry Reqd"
[D54].Select
Cancel = True
End If

If [D55].Value = "" Then
MsgBox "There MUST be an entry in Contact Number!", vbOKOnly, "Entry Reqd"
[D55].Select
Cancel = True
End If

If [D67].Value = "" Then
MsgBox "There MUST be an entry in Utility Type!", vbOKOnly, "Entry Reqd"
[D67].Select
Cancel = True
End If

Application.Dialogs(xlDialogSendMail).… arg1:="made@madeup.com", _
arg2:="Completed Supply Transfer COT Form for <PLEASE INSERT SITE ADDRESS AND/OR MPAN/MPRN>"

End Sub

Problem Solved.

I added 'Exit Sub' just before the 'End If' of each of the defined mandatory fields e.g.

If [D67].Value = "" Then
MsgBox "There MUST be an entry in Utility Type!", vbOKOnly, "Entry Reqd"
[D67].Select
Cancel = True
Exit Sub
End If

This way, the macro stopped after each failed mandatory field.