Hestiacp does not receive emails, SMTP relay active globally for sending (AWS/SES)

That IP is not on that list. This is likely being caused by the use of Spamhaus DNS lookups through a public resolver as indicated in an earlier reply linked by @Raphael.

If you are going to use Spamhaus via DNS you cannot use a shared or public resolver. You need to either remove this DNSbl from your server configuration or change how you process your DNS queries.