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Amazon says that "to maximize deliverability, use "-all" and add a record for each IP address.".
Do they mean their ip address such as 22.214.171.124 or the ip address of the server (in our case, where sendy is installed) ?
Amazon meant that if you used -all instead of ~all, you'd need to add a new TXT record for other servers you're sending from if you don't want your emails to be rejected by ISPs. If you don't send emails from other servers with the same email address you used for sending emails with SES, then you can disregard this.