I'm not an expert in mail server configuration and I'm not that familiar with everything that I need to do to make emails work(configuraing DNS records to work with email delivery, mainly) like a charm with no issues. Therefore I would be glad to receive some links to great videos explaining how it works, what steps I need to proceed in order to configure everything according to some common guidelines or pieces of information about what is wrong with my configuration, because I tried different things and had no luck resolving my issue.
I have my own linux server running Ubuntu 17.04 and I have postfix and dovecot set up for my company emails.
The issue is, that whenever I send emails to an gmail account, in the info, you can see the red icon (http://puu.sh/x8ses/9c1a5fef89.png) and it says "bisart.eu did not encrypt this message".
Original message:
Delivered-To: [email protected]
Received: by 10.12.169.5 with SMTP id y5csp2584881qva;
Sat, 12 Aug 2017 13:07:14 -0700 (PDT)
X-Received: by 10.223.151.212 with SMTP id t20mr12538728wrb.233.1502568434417;
Sat, 12 Aug 2017 13:07:14 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1502568434; cv=none;
d=google.com; s=arc-20160816;
b=izg+I4FrioYQ9iZXkCeJMpZwi8bNCUbQjzsQgGKxLXdaSnp9KcpLNNKhbPKBep5vnG
JIoPaEX/mh1NiwI8ptQJJERxUT168OldzKgUZ7+EVL545Yk0EWBnRCNtdtSZa0yjr88O
8fRnGzp93bn5NR/RE22Fvaw13QMvA4xVFc7m6J+BW7pOSmMwB976UoMw6s0jtUCHYkPR
CxITyX7Wy8G2rR9Px5INQeH+PsKSOQQQAQoMl88Dcy9DOvF6yo8XR/g7tic8jExKO/BT
Cn49sfI3Eg4S8Rs1DatWwp/lw7EViKwHEhZPVqRkxTXP0z3gKhNPdlFnABvUGdDG3Id4
Ly+w==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=content-language:content-transfer-encoding:mime-version:user-agent
:date:message-id:subject:from:to:arc-authentication-results;
bh=QgRLF+6w7sye7fqLzlu3qDfNO47+yGPgui7mTGt5S7Y=;
b=bPF5SMjoQhKivKP4wLWgg9uOkDudgfg/BLWiWycB9kmKxB7Eox9jMrJGSu+1wwHYMw
HadoG0fdXLRFUj3D+/Ur2pWxIfREALH+zHGMIErkTUAN8H6rXZoQrsdrmAFvXYqKMKdq
hk3JyUNoIED2whYzcb1lbS8ANks7hYSXwf0gTKUuzrAoCrRPoIcwWmyXMZEhZeNKhQBW
cGmwbCnwijOSk8iAB/aX/C6cyE4OZ+K9uXbTzbwpL9u/rF83FC54JlTOSd0jpQ3MFv6Y
sCduxKIhz9doud9ebsuB5WqKXXy7m2DlpWbzRsCozbbiKsnT0zZ0+a2UukTu+IZ87mYW
HZ7g==
ARC-Authentication-Results: i=1; mx.google.com;
spf=pass (google.com: domain of [email protected] designates 185.160.111.248 as permitted sender) [email protected]
Return-Path: <[email protected]>
Received: from mail.moowdesign.eu (moowdesign.bisart.eu. [185.160.111.248])
by mx.google.com with ESMTP id k16si2937045wrk.226.2017.08.12.13.07.13
for <[email protected]>;
Sat, 12 Aug 2017 13:07:13 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 185.160.111.248 as permitted sender) client-ip=185.160.111.248;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of [email protected] designates 185.160.111.248 as permitted sender) [email protected]
Received: from [192.168.1.69] (unknown [84.245.121.111]) by mail.moowdesign.eu (Postfix) with ESMTPSA id 19378121987 for <[email protected]>; Sat, 12 Aug 2017 22:07:12 +0200 (CEST)
To: [email protected]
From: Dominik Dancs <[email protected]>
Subject: dsadas
Message-ID: <[email protected]>
Date: Sat, 12 Aug 2017 22:07:10 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
Content-Language: en-US
The thing is, that I have multiple domains pointing to the same host and the same mail server is used (moowdesign.eu, moow.info, fenixportal.eu, etc.) and I need them all to have SSL email encryption.
Each domain points to the IP and mail.domain.tld is set as the MX DNS record (which also points to the server IP).
My ports are forwarded, so all mail traffic can pass to the server.
I use Let'sEncrypt's acme.sh (https://github.com/Neilpang/acme.sh) client to create the wildcard certificate for all domains in one certificate and then use it in dovecot and postfix.
The issue:
So, the Gmail client asks for the emails to be signed by "bisart.eu", but that domain has nothing to do with my server, except only that moowdesign.bisart.eu points to my server and it has reverse records for it. I can't sign the certificate using that domain/server tho.
What should I do? I know that this is not best left as it is, because people would see the red icon and think that it is scam email or something and most likely, all the emails would go straight to spam. I hope there is some kind of a solution.
Also, my DNS records for all domains are (respectively):
3600 IN MX 10 mail
@ 3600 IN A 185.160.111.248
moow.info. 3600 IN TXT "v=spf1 mx a ptr ip4:185.160.111.248/32 a:mail.moow.info a:moowdesign.bisart.eu ~all"
mail 3600 IN A 185.160.111.248
My main.cf (Postfix config file)
compatibility_level = 2
debug_peer_level = 2
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
#daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
default_privs = nobody
myhostname = mail.moowdesign.eu
mydomain = moowdesign.eu
myorigin = $mydomain
mydestination = localhost
append_dot_mydomain = no
unknown_local_recipient_reject_code = 550
mynetworks_style = host
relay_domains = *
alias_maps = hash:/etc/aliases
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = vmail
inet_protocols = ipv4
inet_interfaces = all
meta_directory = /etc/postfix
shlib_directory = /usr/lib/postfix
html_directory = /usr/doc/postfix-3.1.2/html
manpage_directory = /usr/man
sample_directory = /etc/postfix
readme_directory = no
smtpd_tls_cert_file = /etc/dovecot/letsencrypt.crt
smtpd_tls_CAfile = /etc/dovecot/letsencrypt.chain
smtpd_tls_key_file = /etc/dovecot/letsencrypt.key
#smtpd_tls_cert_file = /etc/dovecot/private/mail.crt
#smtpd_tls_key_file = /etc/dovecot/private/mail.key
smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions =
permit_sasl_authenticated,
permit_mynetworks,
reject_unauth_destination,
reject_unknown_reverse_client_hostname,
reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_invalid_hostname,
reject_rbl_client zen.spamhaus.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client barracudacentral.org
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
virtual_mailbox_domains = mysql:/etc/postfix/mysql/virtual_domains_maps.cf
virtual_alias_maps =
mysql:/etc/postfix/mysql/virtual_alias_maps.cf,
mysql:/etc/postfix/mysql/virtual_alias_domain_maps.cf,
mysql:/etc/postfix/mysql/virtual_alias_domain_catchall_maps.cf
virtual_mailbox_maps =
mysql:/etc/postfix/mysql/virtual_mailbox_maps.cf,
mysql:/etc/postfix/mysql/virtual_alias_domain_mailbox_maps.cf
virtual_transport = lmtp:unix:/var/spool/postfix/private/dovecot-lmtp
alias_database = hash:/etc/aliases
Log for sending an email:
Aug 13 13:03:26 production postfix/smtps/smtpd[8768]: warning: hostname 84-245-121-111.dynamic.swanmobile.sk does not resolve to address 84.245.121.111: Name or service not known
Aug 13 13:03:26 production postfix/smtps/smtpd[8768]: connect from unknown[84.245.121.111]
Aug 13 13:03:27 production postfix/smtps/smtpd[8768]: 472971201BC: client=unknown[84.245.121.111], sasl_method=PLAIN, [email protected]
Aug 13 13:03:27 production postfix/cleanup[8772]: 472971201BC: message-id=<[email protected]>
Aug 13 13:03:27 production postfix/qmgr[29192]: 472971201BC: from=<[email protected]>, size=627, nrcpt=1 (queue active)
Aug 13 13:03:27 production postfix/smtps/smtpd[8768]: disconnect from unknown[84.245.121.111] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
Aug 13 13:03:29 production postfix/smtp[8775]: 472971201BC: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[64.233.167.27]:25, delay=1.9, delays=0.17/0/0.87/0.89, dsn=2.0.0, status=sent (250 2.0.0 OK 1502622209 y42si3780413wrd.170 - gsmtp)
Aug 13 13:03:29 production postfix/qmgr[29192]: 472971201BC: removed
Is there anything else that I need to provide information about to be able to resolve this issue?
I tried:
- Creating a self signed certificate on bisart.eu server, then using it on my server with dovecot and postfix (did not help, still says: "bisart.eu did not encrypt this message")
- Creating self signed certificate on my server (did not help)
- Changing myhostname and mydomain properties in main.cf in postfix configuration
- Adding spf record to my DNS
Thank you in advance.