How to remove X-Priority mail header?

Question

linux

Letters go to spam.
Ran a check on mail-tester.com
Received

-0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid
This negative rating will become positive if the signature is validated. See below for how to do this.
-1.274 RDNS_NONE Delivered to internal network by a host with no rDNS
This might be a false positive, but please check your DNS reverse zone
0.001 SPF_HELO_PASS SPF: HELO matches SPF record
0.001 SPF_PASS SPF: sender matches SPF record
Great! Your SPF is valid
-2.749 TVD_SPACE_RATIO_MINFP TVD_SPACE_RATIO_MINFP
-0.01 T_DKIM_INVALID Your DKIM signature is not valid
Take a look at our DKIM test to see why
-0.999 XPRIO A X_PRIORITY header is inserted in your message
Please remove the X_PRIORITY header

How to remove the unfortunate X_PRIORITY header?
Put in the spamassassin config /usr/share/spamassassin/local.cf "score XPRIO -1"
But it didn't help.

Answer 1

1 This header adds an application that sends an email.
2 If you need to remove it on all messages, then read about the Exim parameter remove_headers =