Hello everyone I have this problem when trying to use Wordpress with roundcube and postfix. Here is my setup, I have 2 Debian-Jessie servers (web(nginx)/DB(mysql)/roundcube(web interface)) & (mail server/postfix). I want my Wordpress site to use my mailserver. I can receive and send emails with Roundcube but when I try it with wordpress on port 25 or other ports I get this error:

TLS library problem: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca:s3_pkt.c:1315:SSL alert number 48

Here is the result when I try and test the mail server:

Connecting to XX.XX.XX.XXX
220 mail.example.com ESMTP Postfix (Debian/GNU) [2219 ms]
EHLO PWS3.mxtoolbox.com
250 DSN [797 ms]
MAIL FROM:<supertool@mxtoolbox.com>
250 2.1.0 Ok [828 ms]
RCPT TO:<test@example.com>
454 4.7.1 <test@example.com>: Relay access denied [828 ms]

PWS3v2 6594ms

This is my postfix conf:

# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = /usr/share/doc/postfix
# TLS parameters
smtpd_tls_cert_file = /etc/postfix/smtpd.cert
smtpd_tls_key_file = /etc/postfix/smtpd.key
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated            defer_unauth_destination
myhostname = mail.example.com
alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
myorigin = /etc/mailname
mydestination = mail.example.com, localhost, localhost.localdomain
relayhost =
mynetworks = [::1]/128
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
html_directory = /usr/share/doc/postfix/html
virtual_alias_domains =
virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman,      proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
virtual_mailbox_base = /var/vmail
virtual_uid_maps = mysql:/etc/postfix/mysql-virtual_uids.cf
virtual_gid_maps = mysql:/etc/postfix/mysql-virtual_gids.cf
inet_protocols = all
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated,   reject_unauth_destination, check_recipient_access mysql:/etc/postfix/mysql-    virtual_recipient.cf
smtpd_tls_security_level = may
transport_maps = hash:/var/lib/mailman/data/transport-mailman,      proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps    $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $reloc$
smtpd_sender_restrictions = check_sender_access    regexp:/etc/postfix/tag_as_originating.re , permit_mynetworks,    permit_sasl_authenticated, check_sender_access mysql:/etc/postfix/mysql-   virtual_sender.cf, check_sender_access regexp:/etc/postfix/tag_as_foreign.re
smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-   virtual_client.cf
smtpd_client_message_rate_limit = 100
maildrop_destination_concurrency_limit = 1
maildrop_destination_recipient_limit = 1
virtual_transport = dovecot
header_checks = regexp:/etc/postfix/header_checks
mime_header_checks = regexp:/etc/postfix/mime_header_checks
nested_header_checks = regexp:/etc/postfix/nested_header_checks
body_checks = regexp:/etc/postfix/body_checks
owner_request_special = no
smtp_tls_security_level = may
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2,!SSLv3
smtp_tls_protocols = !SSLv2,!SSLv3
dovecot_destination_recipient_limit = 1
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
content_filter = amavis:[]:10024
receive_override_options = no_address_mappings
message_size_limit = 0
sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
smtpd_restriction_classes = greylisting
greylisting = check_policy_service inet:
smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-     virtual_sender_login_maps.cf
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks,    check_helo_access regexp:/etc/postfix/helo_access, reject_invalid_hostname,    reject_non_fqdn_hostname, check_helo_access regexp:/etc/postfix/blacklist_helo
smtpd_tls_exclude_ciphers = RC4, aNULL
smtp_tls_exclude_ciphers = RC4, aNULL

Here is the Roundcube config file:

$config = array();
/* Do not set db_dsnw here, use dpkg-reconfigure roundcube-core to configure database ! */
// The mail host chosen to perform the log-in.
// Leave blank to show a textbox at login, give a list of hosts
// to display a pulldown menu or set one host as string.
// To use SSL/TLS connection, enter hostname with prefix ssl:// or tls://
// Supported replacement variables:
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %s - domain name after the '@' from e-mail address provided at login screen
// For example %n = mail.domain.tld, %t = domain.tld
$config['default_host'] = 'mail.example.com';
$rcmail_config['force_https'] = true;
// SMTP server host (for sending mails).
// To use SSL/TLS connection, enter hostname with prefix ssl:// or tls://
// If left blank, the PHP mail() function is used
// Supported replacement variables:
// %h - user's IMAP hostname
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %z - IMAP domain (IMAP hostname without the first part)
// For example %n = mail.domain.tld, %t = domain.tld
$config['smtp_server'] = 'tls://mail.example.com';

// SMTP port (default is 25; use 587 for STARTTLS or 465 for the
// deprecated SSL over SMTP (aka SMTPS))
$config['smtp_port'] = 587;
//az go slojih
$config['smtp_auth_type'] = 'PLAIN';
// SMTP username (if required) if you use %u as the username Roundcube
// will use the current username for login
$config['smtp_user'] = '%u';

// SMTP password (if required) if you use %p as the password Roundcube
// will use the current user's password for login
$config['smtp_pass'] = '%p';

// provide an URL where a user can get support for this Roundcube installation
$config['support_url'] = 'www.mainwebsite.com';

// Name your service. This is displayed on the login screen and in the window title
$config['product_name'] = 'MainWebsite Webmail';

// this key is used to encrypt the users imap password which is stored
// in the session record (and the client cookie if remember password is enabled).
// please provide a string of exactly 24 chars.
$config['des_key'] = 'FD71g6CQxVtyM]G3jJpjPH[r';

// List of active plugins (in plugins/ directory)
$config['plugins'] = array(

// skin name: folder from skins/
$config['skin'] = 'classic';

// ----------------------------------
// ----------------------------------

// List of active plugins (in plugins/ directory)
//$rcmail_config['plugins'] = array();
$rcmail_config['plugins'] = array("jqueryui", "ispconfig3_account", "ispconfig3_autoreply", "ispconfig3_pass", "ispconfig3_spam", "ispconfig3_fetchmail", "ispconfig3_filter");

// az go addnah za da prashtam emails uj
$config['smtp_conn_options'] = array(
'ssl'         => array(
 'verify_peer'      => false,
 'verify_peer_name' => false,

I've read several other posts about this problem and it seems I have messed up the certificates? My main server (where the web and roundcube interface is) is using Let's Encrypt certificate and I don't have it on the mail server. If you guys need more information please ask, I am kinda confused what I am doing wrong.

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