I register LetEncrypt ca from https://gethttpsforfree.com/ , create the email server ( postfix + dovecot + rainloop webmail ) but i use ssl imap
rainloop show error :
stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
mailog error is:
Disconnected (no auth attempts in 0 secs): user=<>, rip=xx.xx, lip=xx.xx, TLS handshaking: SSL_accept() failed: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca: SSL alert number 48
but i use unibox app or Mac os email client not error
and I help rainloopissues#932
Rainloop say :
RainLoop uses standard php functionality to work with ssl connections. So, you should setup ssl (let's encrypt ssl ca) somewhere in php.ini, I think.
the postfix setting is :
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/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 = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = domain.com
myhostname = mail.domain.com
mynetworks = 127.0.0.0/8,163.44.149.110
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
relay_domains = $mydestination
sample_directory = /usr/share/doc/postfix-2.10.1/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_tls_note_starttls_offer = yes
smtp_tls_security_level = may
smtpd_banner = $myhostname ESMTP $mail_name unkown
smtpd_client_restrictions = reject_rbl_client, permit
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_rhsbl_sender, permit
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = reject_non_fqdn_sender, permit
smtpd_tls_cert_file = /etc/ssl/certs/chained.pem
smtpd_tls_key_file = /etc/ssl/private/domain.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual
virtual_gid_maps = static:500
virtual_mailbox_base = /home/vmail
virtual_mailbox_domains = lxh.tech
virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox
virtual_minimum_uid = 1001
virtual_uid_maps = static:5000
dovecot setting is :
auth_mechanisms = plain login
mail_location = maildir:~/Maildir
mbox_write_locks = fcntl
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
}
passdb {
driver = pam
}
passdb {
args = /etc/dovecot/virtual_passwd
driver = passwd-file
}
passdb {
driver = pam
}
protocols = imap pop3
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0666
user = postfix
}
}
ssl = required
ssl_cert = </etc/ssl/certs/chained.pem
ssl_key = </etc/ssl/private/domain.key
userdb {
driver = passwd
}
userdb {
args = uid=vmail gid=vmail home=/home/vmail/%d/%n
driver = static
}
userdb {
driver = passwd
}
is setting php openssl support LetEncrypt ca?
So I concluded Rainloop s*cks *ss and I deleted it.. 
