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SendGrid exposes it for like 14 days I believe. I tried like hell to get data from before that and support told me you're required to store that yourself. So not super helpful until you realize you needed it in the first place.

Postmark shows the body for 45 days by default, and it can be extended to up to a year. https://postmarkapp.com/email-analytics

This is very true, but I can understand why a transactional provider probably doesn't want to sit on masses of old data like that. Marketing ESP's all usually store the data indefinitely.

Sendgrid doesn't log sent email bodies, as a simple example. Think harder!

Their webhook doesn't send the full body? I'm sure you at least get the data if not the exact data sent...

I don't think any email provider sends the body via webhook. AWS SES certainly doesn't, which I think Resend is built on

Mailgun does

If SendGrid fails to send an email it won't tell you why or that you even attempted to send an email.