Just a long shot but check your dovecot settings in the /etc/dovecot/ directory and make sure SSL encryption is optional - not required. Also, dovecot would be looking for an SSL certificate. We always point that setting to the SSL certificates at /var/qmail/control/servercert.pem. And although complicated to setup we get our mailserver certs from Lets Encrypt.


On 11/21/2019 12:13 AM, wrote:
Use roundcube :)

Il giorno 20 nov 2019, alle ore 02:50, ChandranManikandan <> ha scritto:

Hi Friends,

I have installed qmt on centos 7 and tried to send an email it getting below message.

Message not sent. Server replied:

    Encryption required for requested authentication mechanism
    538 auth not available without TLS (#5.3.3)

    Could anyone facing this issue? and what causes?


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