imap problem

Ladislav Slanina ladas at
Fri Oct 18 12:46:59 CEST 2019

Hi everybody.

Can somebody kick me to correct way? 
When I would like to send email from WEB GUI I get message: ERROR: SMTP ERROR: 
[554] 5.7.1 <DATA>> Data command rejected: Unverifiable sender.

The same messag I discovered in maillog for Outlook comunication. Whole 
traffic stop! May I ask for some fast advice, please?

Greetings, ladas

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