I no longer see TLS details in the header. I checked maillog and
TLS is being established.
---------------
From maillog:
Nov  8 07:49:44 theranch postfix/smtpd[30627]: Anonymous TLS connection
established from nm27.bullet.mail.ne1.yahoo.com[98.138.90.90]: TLSv1.2
with cipher ECDHE-RSA-AES128-GCM-SHA2 56 (128/128 bits)
------------------------

Header (slightly sanitized to stay off of google)
-------------------------------------
From: some dude <somed...@yahoo.com>
To: "me" <m...@mydomain.com>
Subject: from yahoo
Date: Tue, 8 Nov 2016 07:49:41 +0000 (UTC)
Reply-To: some dude <somed...@yahoo.com>
Return-Path: <somed...@yahoo.com>
X-Original-To: m...@mydomain.com
Delivered-To: m...@mydomain.com
X-Virus-Scanned: amavisd-new at mydomain.com
Authentication-Results: www.mydomain.com (amavisd-new);
 dkim=pass (2048-bit key) header.d=yahoo.com
DKIM-Filter: OpenDKIM Filter v2.10.3 www.mydomain.com 6AA43EB20F
Authentication-Results: mydomain.com;
 dkim=pass (2048-bit key; unprotected) header.d=yahoo.com
header.i=@yahoo.com header.b=trAlWMaE DKIM-Signature: v=1;
a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1478591383;
bh=cRZGv5wOLgNFzbAfI5tLNkRMXYbHl/vWifDflA5eMtw=;
h=Date:From:Reply-To:To:Subject:References:From:Subject;
b=trAlWMaE/s+6aINuk6b6ySW6h1CZF6LiKQOfQgoUg4i8JzjySXbgBkAOuH+GAb55+QQHA6A8sjJeK77UvhVUS+BkAyZMiTAMkt8m9kMe77m31MjzWQ4Ig82CXogOA5+SESyKrwZZAuipFGuIq4APO06SM0hCGBmUJYHNuYytxKpTrW5FT8TFXm89vq2+MspXjd1k75qcQ+fF1kwst3n6X28teuV6o65mInGqL9vkrPrwtOGihdQqcrepyEkRnU7RflFRb1rtC0zS9pVuo1/ZcJjKeldeHsYzDzDpdiOiJNXokcRot/X5yidLYkgI5JkSPbFHe+HgQupWXOxdMxI8iQ==
X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id:
878361.88180...@omp1007.mail.ne1.yahoo.com X-YMail-OSG:
nEWp4QsVM1nZt5mFz73vbEgYx.Lt3B_GBcEvOTw0Vp0LtD3J99f0OjdWkUcARg5
fQOYXcuRTpVY9z.FPYba81.F6ZWzTg7R9.2qD4awC6TFWAARiWK43ECrmkWodJuHDdL8gxc3OyX5
LAcxtI9b9TGqh0OfPAU1dWmpLs3sALzDSN3bWIvvbmDfRoJfwshV.Z3NlBRXE0BTRlXIEZ9yTMHP
7hroI1tkmFwOOVOqUs8YFevk0ma39L1OCaZ4tkr2rr0Tv0pkkgrCdXiHJIWrUNNEHrsQsePKlcn7
3TI.yj5J2Xocsga14Zqbnn6Nkm8QYuTeELAPA5RIb4VUNcptkCZQcyeUF8ikKx9aVKM31kGveMNe
ANNorn_lvKSS9u2P95D2V6dsUcZwujC5ctuWOtFZN1qheWGIOXTfP3HkjaVIq9AYQBFX_EA50W1f
3.O5tpuiZsim9J7g6CQxJPkQq4HzhmTNxAQ6iKABKju3ukJKUoFtNlC8V5qzon6y5M4AJEH3B1ep
ObjfCt_ERaTcEhRs2wQ_sCyg-

from yahoo
-----------------------------------------


# postconf -n (sanitized also)


broken_sasl_auth_clients = yes
command_directory = /usr/local/sbin
compatibility_level = 2
content_filter = amavisfeed:[127.0.0.1]:10024
daemon_directory = /usr/local/libexec/postfix
data_directory = /var/db/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd 
$daemon_directory/$process_name $process_id & sleep 5
home_mailbox = Maildir/
html_directory = /usr/local/share/doc/postfix
inet_interfaces = all
inet_protocols = ipv4
lmtp_tls_mandatory_protocols = !SSLv2, !SSLv3
lmtp_tls_protocols = !SSLv2, !SSLv3
mail_owner = postfix
mailbox_command = /usr/local/libexec/dovecot/deliver
mailbox_size_limit = 0
mailq_path = /usr/local/bin/mailq
manpage_directory = /usr/local/man
message_size_limit = 0
milter_default_action = accept
milter_protocol = 6
mydomain = somedomain.com
myhostname = www.somedomain.com
mynetworks_style = host
myorigin = $mydomain
newaliases_path = /usr/local/bin/newaliases
non_smtpd_milters = $smtpd_milters
policyd-spf_time_limit = 3600
queue_directory = /var/spool/postfix
readme_directory = /usr/local/share/doc/postfix
sample_directory = /usr/local/etc/postfix
sendmail_path = /usr/local/sbin/sendmail
setgid_group = maildrop
smtp_tls_ciphers = medium
smtp_tls_exclude_ciphers = EXPORT, LOW
smtp_tls_loglevel = 2
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_security_level = may
smtpd_client_restrictions = permit_sasl_authenticated, permit_mynetworks, 
reject_unauth_destination, check_client_access 
hash:/usr/local/etc/postfix/spamsources
smtpd_milters = inet:127.0.0.1:8891
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, 
reject_unauth_destination, check_client_access 
hash:/usr/local/etc/postfix/rbl_override, reject_rbl_client 
rhsbl.scientificspam.net, reject_rbl_client bl.spamcop.net, reject_rbl_client 
cbl.abuseat.org, reject_rbl_client b.barracudacentral.org, reject_rbl_client 
ix.dnsbl.manitu.net, reject_rbl_client rabl.nuclearelephant.com, 
reject_rbl_client zen.spamhaus.org, check_policy_service 
unix:private/policyd-spf, permit
smtpd_relay_restrictions = permit_sasl_authenticated, permit_mynetworks, 
reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks, 
reject_unauth_destination, check_sender_access 
hash:/usr/local/etc/postfix/spamsources
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /usr/local/etc/ipsec.d/certs/somedomain.com.crt
smtpd_tls_ciphers = medium
smtpd_tls_exclude_ciphers = EXPORT, LOW
smtpd_tls_key_file = /usr/local/etc/ipsec.d/private/somedomain.com.key
smtpd_tls_loglevel = 1
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2, !SSLv3
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
tlsproxy_tls_mandatory_protocols = $smtpd_tls_mandatory_protocols
tlsproxy_tls_protocols = $smtpd_tls_protocols
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/usr/local/etc/postfix/virtual
virtual_gid_maps = static:1003
virtual_mailbox_base = /var/mail/vhosts
virtual_mailbox_domains = /usr/local/etc/postfix/virtual_domains
virtual_mailbox_limit = 0
virtual_mailbox_maps = hash:/usr/local/etc/postfix/vmailbox
virtual_minimum_uid = 1003
virtual_uid_maps = static:1003

------------------------
# uname -a
FreeBSD theranch 10.3-RELEASE-p11 FreeBSD 10.3-RELEASE-p11 #0: Mon Oct
24 18:49:24 UTC 2016
r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

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