Josh Kersey d8d1407c61 SendGrid: change message_id from Message-ID/smtp-id to UUID anymail_id ...

SendGrid does not always correctly provide the sent Message-ID header value 
to a tracking webhook's smtp-id field, making it unreliable to use for Anymail's 
`message_id`.

Instead, generate a UUID `message_id` for Anymail tracking, and pass it from 
send to webhooks in SendGrid custom args as anymail_id.

Webhooks will fall back to smtp-id for compatibility with previously-sent 
messages that didn't have an anymail_id custom arg.

Fixes #108

2018-05-30 11:52:36 -07:00

11 KiB

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