Missing logs: This is with the new combo certificate
Mail log: Jan 19 14:52:55 mcq postfix/smtpd[156224]: warning: TLS library problem: error:0908F066:PEM routines:get_header_and_data:bad end line:crypto/pem/pem_lib.c:856: Jan 19 14:52:55 mcq postfix/smtpd[156224]: warning: error loading private keys and certificates from: /etc/postfix/tls/ws.pem: disabling TLS support Jan 19 14:52:55 mcq postfix/smtpd[156224]: connect from _gateway[192.168.1.1] Jan 19 14:52:55 mcq postfix/smtpd[156224]: lost connection after STARTTLS from _gateway[192.168.1.1] Jan 19 14:52:55 mcq postfix/cleanup[156230]: 12CF610BC904: message-id=<20220119195255.12cf610bc...@mcq.sbanetweb.com> Jan 19 14:52:55 mcq postfix/qmgr[156204]: 12CF610BC904: from=<double-bou...@mcq.sbanetweb.com>, size=914, nrcpt=1 (queue active) Jan 19 14:52:55 mcq postfix/smtpd[156224]: disconnect from _gateway[192.168.1.1] ehlo=1 starttls=0/1 commands=1/2 Jan 19 14:52:55 mcq postfix/local[156232]: 12CF610BC904: to=< >, orig_to=<postmaster>, relay=local, delay=0.07, delays=0.04/0.01/0/0.02, dsn=2.0.0, status=sent (delivered to maildir) Jan 19 14:52:55 mcq postfix/qmgr[156204]: 12CF610BC904: removed Messages: Jan 19 13:51:53 mcq postfix[151328]: /usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: $smtp_tls_key_file=/etc/postfix/tls/.key Jan 19 13:51:53 mcq postfix[151328]: /usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: $smtpd_tls_cert_file=/etc/postfix/tls/ws.pem Jan 19 13:51:53 mcq postfix[151335]: /usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: $smtp_tls_key_file=/etc/postfix/tls/ key Jan 19 13:51:53 mcq postfix[151335]: /usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: $smtpd_tls_cert_file=/etc/postfix/tls/ws.pem Jan 19 13:51:53 mcq postfix[151328]: /usr/sbin/postconf: warning: /etc/postfix/main.cf: unused parameter: $smtp_tls_key_file=/etc/postfix/tls/ key Email from Postfix SMTP Error: Transcript of session follows. Out: 220 mcq.sbanetweb.com ESMTP Postfix In: EHLO sonic309-21.consmr.mail.ne1.yahoo.com Out: 250-mcq.sbanetweb.com Out: 250-PIPELINING Out: 250-SIZE 10240000 Out: 250-VRFY Out: 250-ETRN Out: 250-STARTTLS Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250-DSN Out: 250-SMTPUTF8 Out: 250 CHUNKING In: STARTTLS Out: 454 4.7.0 TLS not available due to local problem In: MAIL FROM:< > Out: 250 2.1.0 Ok In: RCPT TO:< > Out: 450 4.7.1 < >: Recipient address rejected: Greylisted for 10 minutes In: QUIT Out: 221 2.0.0 Bye You asked : set smtp_tls_loglevel = 1, which I did (see prior email) You asked: > smtpd_tls_cert_file = /etc/postfix/tls/ServerCert-combined.pem This file contains just the server certificate. Did you append the (PEM formatted) issuer certificate(s)? I said I tried it two different ways, but one way was Private Key Server certificate, Intermediate Certificate. When I did that, that is when all the error message begin. Lastly, you want me to change the submission and smtps entries in master.cf, which I have done as of this email.