Use roundcube :) 

> Il giorno 20 nov 2019, alle ore 02:50, ChandranManikandan <kand...@gmail.com> 
> 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?
> 
> 
> -- 
> Regards,
> Manikandan.C
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