I think the solution is

Protocol  : TLSv1.2    
Cipher    : ECDHE-RSA-AES256-GCM-SHA384

The server is protected by *"Perfect Forward Secrecy (PFS)" 
https://www.heinlein-support.de/blog/security/perfect-forward-secrecy-pfs-fur-postfix-und-dovecot/
 
<https://www.heinlein-support.de/blog/security/perfect-forward-secrecy-pfs-fur-postfix-und-dovecot/>*


How I can change the cipher in Android and K-@Mail?


Am Samstag, 23. Januar 2016 12:19:03 UTC+1 schrieb Andreas Günther:
>
> Hello,
>
> I am using K-@ Mail Pro Version 1.10.0 and have problems to connect to my 
> SMPT-Server (Postfix/Submisson) and IMAPs-Server (Dovecot).
> For the outgoing server I take my URL to  my server, "STARTTLS(alwyas)", 
> "Port 587", "PLAIN", my username and password simular as on my 
> Desktop-Client Kmail. But a connection from k-@ Mail Pro to my server isn't 
> possible.
> The log file says:
>
>
>
> *Jan 23 12:11:16 mail postfix/smtpd[2146]: Anonymous TLS connection 
> established from p5dc16510.dip0.t-ipconnect.de 
> <http://p5dc16510.dip0.t-ipconnect.de>[93.193.101.16]: TLSv1.2 with cipher 
> DHE-RSA-AES256-SHA (256/256 bits)Jan 23 12:11:18 mail postfix/smtpd[2146]: 
> warning: p5DC16510.dip0.t-ipconnect.de 
> <http://p5DC16510.dip0.t-ipconnect.de>[93.193.101.16]: SASL PLAIN 
> authentication failed:Jan 23 12:11:24 mail postfix/smtpd[2146]: warning: 
> p5DC16510.dip0.t-ipconnect.de 
> <http://p5DC16510.dip0.t-ipconnect.de>[93.193.101.16]: SASL LOGIN 
> authentication failed: UGFzc3dvcmQ6*
>
> echo "UGFzc3dvcmQ6" | base64 -d
> shows
> *"Password:"*
> What's wrong with K-@Mail, why do it deliver a wrong passwort?
>
> Regards
>
> Andreas
>

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