Problem SSL entrust certificate

Hi I have compiled dovecot 2.3.6 on RH 8, and I copied the configuration from dovecot 2.0.9 however, when I try to connect the new machine the certificate is not recognized The same certificate is working with apache

CONNECTED(00000004) depth=0 ... verify error:num=20:unable to get local issuer certificate verify return:1 depth=0 ... verify error:num=21:unable to verify the first certificate verify return:1 ...

No client certificate CA names sent Peer signing digest: SHA256 Peer signature type: RSA-PSS Server Temp Key: X25519, 253 bits

SSL handshake has read 2311 bytes and written 404 bytes Verification error: unable to verify the first certificate