Hi Eric

Thanks for the suggestion. I think I'll certainly go that route for the webmail clients -- Roundcube, Rainloop and Squirrelmail -- for the reasons you suggest.

However, I also need to make this setup work with desktop and mobile clients like Apple Mail and Postbox, and they will need a secure channel to the server.

Thanks again,


On 2019-07-22 22:40, Eric's mail wrote:

Did you think about simply using port 25, no authentication or
encryption, which is how squirrelmail on QMT used to be configured,
relying on HTTPS alone for password and email security across the
cloud as the email (after the cloud) is submitted directly to the
server (tcpserver) by the server (apache) itself ( rendering
encryption useless or redundant. I think this is the route I will go
because with every upgrade of roundcube, the webmail I prefer, there
seems to be issues with past configurations.


Get Outlook for Android [1]

On Mon, Jul 22, 2019 at 5:46 PM -0600, "Angus McIntyre"
<an...@pobox.com> wrote:

r...@mattei.org wrote on 7/22/19 10:22 AM:
You need to install the cert on your machine. Does the /etc/hosts
have the name of your machine can you try to ping that name to
see if it resolves?

The certificate is installed.

The hostname in '/etc/hosts' resolves, and responds to pings.

I replaced the self-signed PEM that shipped with qmailtoaster with
that I made myself by concatenating the ‘.key’ and ‘.crt’
files from my
server certificate. Inspecting the resulting .pem with ‘openssl
x509 -in
servercert.pem -text’ confirms that the resulting .pem is for the
that I expect. File permissions and ownership are correct.

'/etc/hosts' for my newly-built server contains the following line: s6.mydomain.com s6

(obviously, 'mydomain' is not the actual name here). The .pem file
contains the lines:

Subject: OU=Domain Control Validated, OU=PositiveSSL,


X509v3 Subject Alternative Name:
DNS:mail.mydomain.dev, DNS:www.mail.mydomain.dev

's6.mydomain.com' and 'mail.mydomain.dev' all resolve to the same

My existing qmailtoaster server (running an older version of the
software) has '/etc/hosts' containing: s2.mydomain.com s2

and the .pem file contains:

Subject: OU=Domain Control Validated, OU=PositiveSSL Multi-Domain,


X509v3 Subject Alternative Name:
DNS:mydomain.com, DNS:mail.mydomain.com, DNS:www.mydomain.com

's6.mydomain.com' resolves to the same IP as 'mail.mydomain.dev';
's2.mydomain.com' resolves to the same IP as 'mail.mydomain.com'.

As far as I can see, the two situations are equivalent, with the
difference that the official server name of the new box
('s6.mydomain.com') is not a subdomain of the domain in the PEM file

('mail.mydomain.dev'), whereas on the old box the name of the host
('s2.mydomain.com') is a subdomain of one of the domain names in the
file ('mydomain.com'). I don't know if this is a possible cause of

One other difference is that I don’t have a PTR record for
's6.mydomain.com'. An RDNS lookup on the IP of 's2.mydomain.com'
yield 's2.mydomain.com', but an RDNS lookup on the IP of
's6.mydomain.com' yields the FQDN of the Linode VM it runs on. Could

that be an issue?

I'll keep digging on this, but if anyone has any suggestions of
tests or
tools I might use, I'd welcome your recommendations.



Il giorno 21 lug 2019, alle ore 20:03, Angus McIntyre ha scritto:

Thanks to a great deal of help from Remi and Eric, I have now
managed to get my Ansible role to the point where it can
successfully build out a QMailToaster server running PHP 7.1 and
RoundCube 1.4rc1.

However, because nothing is ever that easy, RoundCube and
SquirrelMail have now stopped sending mail (RainLoop works fine).

1) SquirrelMail

SquirrelMail was installed from the qmailtoaster RPMs, using:

yum --enablerepo=qmt-testing update
yum --enablerepo=qmt-devel update

as on the homepage of qmailtoaster.com. After installation, I
patched the Squirrelmail config and the smtps supervise as directed


Attempting to send from SquirrelMail produces the message:

0 Can't open SMTP stream

The /var/log/qmail/smtps/current log shows:

2019-07-22 02:45:15.173127500 tcpserver: status: 1/100
2019-07-22 02:45:15.179903500 tcpserver: pid 2843 from
2019-07-22 02:45:15.179905500 tcpserver: ok 2843 s6:
2019-07-22 02:45:15.197381500 tcpserver: end 2843 status 256
2019-07-22 02:45:15.197383500 tcpserver: status: 0/100

2) RoundCube

RoundCube is 1.4rc1, installed from the remi-test repo. Following
Eric's instructions, I edited '/etc/roundcubemail/config.inc.php' so
that it contains:

$config['smtp_server'] = 'tls://mail.myhost.com';

$config['smtp_conn_options'] = array(
'ssl' => array(
'peer_name' => 'mail.myhost.com',
'verify_peer' => true,
'verify_depth' => 3,
'cafile' => '/var/qmail/control/servercert.pem',

(where 'mail.myhost.com' is the actual name of my mailserver, as
it appears in the 'servercert.pem' file).

Trying to send from RoundCube produces a 220 Authentication
Failed message. The transcript in RoundCube's SMTP log looks like:

[21-Jul-2019 22:26:08 -0400]: Connecting to
[21-Jul-2019 22:26:08 -0400]: Recv: 220 s6.myhost.net -
Welcome to Qmail Toaster Ver. 1.03-2.1.qt.el7 SMTP Server ESMTP
[21-Jul-2019 22:26:08 -0400]: Send: EHLO mail.myhost.com
[21-Jul-2019 22:26:08 -0400]: Recv: 250-s6.myhost.net -
Welcome to Qmail Toaster Ver. 1.03-2.1.qt.el7 SMTP Server
[21-Jul-2019 22:26:08 -0400]: Recv: 250-STARTTLS
[21-Jul-2019 22:26:08 -0400]: Recv: 250-PIPELINING
[21-Jul-2019 22:26:08 -0400]: Recv: 250-8BITMIME
[21-Jul-2019 22:26:08 -0400]: Recv: 250 SIZE 20971520
[21-Jul-2019 22:26:08 -0400]: Send: STARTTLS
[21-Jul-2019 22:26:08 -0400]: Recv: 220 ready for tls
[21-Jul-2019 22:26:08 -0400]: Send: RSET
[21-Jul-2019 22:27:08 -0400]: Send: QUIT
[21-Jul-2019 22:27:08 -0400]: Recv: 454 TLS connection
failed: error:140760FC:SSL
protocol (#4.3.0)

3) Desktop client

Trying to send from a desktop client (PostBox) also fails,
generating the warning:

Could not verify this certificate because the issuer is unknown

The issuer in this case is actually Sectigo, which is the new
name for Comodo, who should be reasonably reputable.

The 'servercert.pem' file that I'm using is generated from the
same '.key' and '.crt' files that I use to secure the webserver,
which appear to work fine in that context.

Has anyone encountered this issue, or can suggest a possible fix?

Thanks for any help you can give me,


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