Asides from the email delivery issue you highlighted, Email-validated ACM certificates require manual intervention to get them renewed. This is why the AWS recommended validation method is DNS Validation .
With DNS Validation, you don't have to worry about emails being delivered or not. All you need do is insert a validation CNAME provided by ACM to your DNS database and the certificate will be validated and automatically renewed as long as it is in use  (i.e associated with one of the supported services) and all these other conditions stated here  are met.
 DNS validation https://docs.aws.amazon.com/acm/latest/userguide/dns-validation.html
 Services integrated with AWS Certificate Manager https://docs.aws.amazon.com/acm/latest/userguide/acm-services.html
 Managed renewal for ACM certificates https://docs.aws.amazon.com/acm/latest/userguide/managed-renewal.html
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