[msmtp-users] Issue with certificate

[Jonny Doe <weertex@...20...>]

I'm having problems with msmtp accepting SSL certificate for my email provider.

$ msmtp --serverinfo --host=gator1860.hostgator.com --tls=on --tls-certcheck=off

SMTP server at gator1860.hostgator.com (gator1860.hostgator.com [50.97.97.38]), port 25:

    gator1860.hostgator.com ESMTP Exim 4.77 #2 Wed, 30 May 2012 11:57:39 -0500 

TLS certificate information:

    Owner:

        Common Name: *.hostgator.com

        Organizational unit: Domain Control Validated

    Issuer:

        Common Name: PositiveSSL CA 2

        Organization: COMODO CA Limited

        Locality: Salford

        State or Province: Greater Manchester

        Country: GB

    Validity:

        Activation time: Tue 29 May 2012 01:00:00 BST

        Expiration time: Tue 30 May 2017 00:59:59 BST

    Fingerprints:

        SHA1: 76:00:DF:3A:B4:AE:70:D9:D2:6D:8A:FE:5C:15:63:1A:F2:64:D0:AC

        MD5:  6F:FF:FB:B6:51:B1:F2:D3:2C:B4:26:34:AD:40:B2:7B

Capabilities:

    SIZE 52428800:

        Maximum message size is 52428800 bytes = 50.00 MiB

    PIPELINING:

        Support for command grouping for faster transmission

    STARTTLS:

        Support for TLS encryption via the STARTTLS command

    AUTH:

        Supported authentication methods:

        PLAIN LOGIN 

According to the above I need PositiveSSL CA 2 from Comodo which can be found here (second from the top):

https://support.comodo.com/index.php?_m=downloads&_a=view&parentcategoryid=4

I have downloaded it and added a line to msmtprc -

tls_trust_file   /usr/share/ca-certificates/PositiveSSLCA2.crt

But when I try to send an email it gives me an error:

msmtp: TLS certificate verification failed: the certificate hasn't got a known issuer

How can I fix that? Tnaks!