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Thanks you all for comments. I have made a decision to subscribed to dedicated IPs (credits: @slau).

The differentiating factor between our current AWS SES plan and the competitors (mentioned in the comments) is having a dedicated IP. With our current volume, none of the competitors are anyway near AWS SES costs. So, moving to a dedicated IPs thats cost 25$ extra not only solves our issue, but also no change in code/infrastructure.

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Just make sure you have sufficient traffic to warrant a dedicated IP. An unknown IP suddenly sending a burst of emails is going to get soft-blocked very quickly. You need to build up your reputation, and you need to slowly increase how much you send.

The managed IP is an option, although I’ve never used it.

When I was the VPoE at Dixa, we switched over to SES, and we had 3 dedicated IPs, and for our volume back then (a few thousand emails a day), this worked very well. I don’t know if they ever hit scaling issues after I left.

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