httpd server signature off

Hi

for security reason i want to get rid off

Cyrus-HTTP/3.0.6-Debian-3.0.6-6+deb1u1 Cyrus-SASL/2.1.23 OpenSSL/1.1 
Zlib/1.2.10 LibXML2.9.5 SQLite/3.21.1 LibiCal/3.0 ICU4C/63.1 
Jansson/2.12 Server at cyrus.domain.com Port 9443

like apache using

ServerTokens Prod or ServerSignature Off


Have I try serverinfo: off in imapd.conf but it don't work

What should i do

Cyril

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