If you create a pool for each of the domains you send from, and the rDNS of the IPs in those pools match the domain in the From address, you’ll be able to successfully deliver your email. If you create IP pools, you’ll be able to specify which pool of IPs a message will go through. In some cases, senders will be able to set up IP pools to address this issue. The requirements from are clear: if the domain in the From address doesn’t match the SPF, DKIM, and rDNS domains, it will reject the email. I have dedicated IPs, but I send email from a number of different domains. If communication with your recipients is critical for your organization, we recommend that you upgrade to a dedicated IP address, then configure Domain Authentication and custom rDNS to achieve proper alignment. Every organization using shared IPs to send messages to recipients, regardless of the email service provider, has been impacted. The negative impacts of these changes are not limited to Twilio SendGrid customers. Unfortunately, has implemented a set of requirements that is fundamentally incompatible with shared IP sending. There is no resolution for this issue for senders who want to stay on shared IPs. I use shared IP addresses and is blocking my email.
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