Send Button Stuck

[xeeshan-Mustafa]

postfix/smtps/smtpd[366779]: connect from localhost[127.0.0.1]
postfix/smtps/smtpd[366779]: SSL_accept error from localhost[127.0.0.1]: -1
warning: TLS library problem: error:0A000412:SSL routines::sslv3 alert bad certificate:../ssl/record/rec_layer_s3.c:1584:SSL alert number 42:
lost connection after CONNECT from localhost[127.0.0.1]

letsencrypt is working fine

if i use unsecure port in webmail then issue resolve
there is no issue in connecting through microsoft outlook on secure ports

any help ?