Django SendGrid how to pass unique_args in EmailMultiAlternatives mail object

Question

SendGrid provides the ability to pass unique_args with email so that to identify the email in the Event webhook. But the problem is I am not able to figure out how to send these unique_args with the email in Django. This is how I am currently attempting to do it:

from django.core.mail import EmailMultiAlternatives

header ={
  "unique_args": {
    "customerAccountNumber": "55555",
    "activationAttempt": "1",
    "New Argument 1": "New Value 1",
    "New Argument 2": "New Value 2",
    "New Argument 3": "New Value 3",
    "New Argument 4": "New Value 4"
  }
}

subject, from_email, to = 'hello', 'EXAMPLE@FROM.com', 'EXAMPLE@TO.NET'
text_content = 'This is an important message.'
msg = EmailMultiAlternatives(
subject,
text_content,
from_email,
[to,],
headers=header,
)
msg.send()

Answer 1

ok, So finally I found the solution. Finally, I figured out how to send unique_args to SendGrid with Django EmailMultiAlternatives. Here is my working solution:

    from django.core.mail import EmailMultiAlternatives
    from smtpapi import SMTPAPIHeader
    header = SMTPAPIHeader()
    header.set_unique_args({'customerAccountNumber': '12345','activationAttempt': '1'})

    subject, from_email, to = 'hello', 'EXAMPLE@FROM.com', 'EXAMPLE@TO.NET'
    text_content = 'This is an important message.'
    msg = EmailMultiAlternatives(
        subject,
        text_content,
        from_email,
        [to,],
        headers={'X-SMTPAPI': header.json_string()},
    )
    msg.send()

You also need to install a smtpapi package by pip install smtpapi

Answer 2

    from django.core.mail import EmailMultiAlternatives
    from smtpapi import SMTPAPIHeader
    smtp_header = SMTPAPIHeader()
    smtp_header.set_unique_args({'customerAccountNumber': '12345','activationAttempt': '1'})

    subject, from_email, to = 'hello', 'hello@FROM.com', 'AABC@TO.NET'
    text_content = 'This is message.'
    msg = EmailMultiAlternatives(
        subject,
        text_content,
        from_email,
        [to,],
        headers={'X-SMTPAPI': smtp_header.json_string()},
    )
    msg.send()