Unable to send email using VBA

Unable to send email using VBA

Issue Faced -
I am trying to send email using vba, but throws me error - 

Code used - 
Sub SendEmailUsingzoho(sTrnrEmail, saveFileName)
    On Error GoTo Err:

    'late binding
    Set NewMail = CreateObject("CDO.Message")
    Set mailConfig = CreateObject("CDO.Configuration")

    ' load all default configurations
    mailConfig.Load -1

    Set fields = mailConfig.fields

    'Set All Email Properties
    With NewMail
        .From = "****"
        .To = sTrnrEmail
        .CC = ""
        .BCC = ""
        .Subject = "Salary Slip for " & Format(Now(), "mmmm, yyyy")
        .TextBody = "Hello, Please find attached the Salary Slip for " & Format(Now(), "mmmm, yyyy") & "! Let us know if you have any questions about the same. Thanks :)"
        .AddAttachment saveFileName
    End With


    With fields
        .Item(msConfigURL & "/smtpusessl") = True               'Enable SSL Authentication
        .Item(msConfigURL & "/smtpauthenticate") = 1            'SMTP authentication Enabled
        .Item(msConfigURL & "/smtpserver") = "smtp.zoho.com"    'Set the SMTP server details
        .Item(msConfigURL & "/smtpserverport") = 25            'Set the SMTP port Details
        .Item(msConfigURL & "/sendusing") = 2                   'Send using default setting
        .Item(msConfigURL & "/sendusername") = "**"  'Your zoho address
        .Item(msConfigURL & "/sendpassword") = "*********"   'Your password or App Password
        .Update                                              'Update the configuration fields
    End With
    NewMail.Configuration = mailConfig
    NewMail.Send
    
    MsgBox "Your email has been sent", vbInformation

Exit_Err:
    'Release object memory
    Set NewMail = Nothing
    Set mailConfig = Nothing
    End

Err:
    Select Case Err.Number
    Case -2147220973  'Could be because of Internet Connection
        MsgBox "Check your internet connection." & vbNewLine & Err.Number & ": " & Err.Description
    Case -2147220975  'Incorrect credentials User ID or password
        MsgBox "Check your login credentials and try again." & vbNewLine & Err.Number & ": " & Err.Description
    Case Else   'Report other errors
        MsgBox "Error encountered while sending email." & vbNewLine & Err.Number & ": " & Err.Description
    End Select

    Resume Exit_Err

End Sub