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Apache does not permit you to remove the server header. You can limit information with the ServerTokens and ServerSignature directives.
Nginx also does not permit removal of the header. You can set tokens off in Nginx as well to minimize the information.
There are 3rd party modules...
Please see this issue:
Mail send failure on Plesk server: "You are not allowed to use sendmail utility. REJECT"
I had this on a server that had been through a number of major version upgrades.
The error you see is what is known as Forward-Confirmed reverse DNS (FCrDNS). This basically means that the hostname's A record must match the reverse DNS (PTR) record for the IP.
While some legacy email service providers may use this and a few anti-spam solutions check this value, I do...