Tested and that fixes it 
Thank you very much 
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Thank you all for the amazing work, especially to @Elleni who was very patient and tried multiple things!
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yes mates…It is a pleasure to work with guys like you
the rpm is waiting testing
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@Elleni would you mind test the new package and report back?
Just execute:
yum --enablerepo=nethserver-testing update nethserver-mail\*
Edit: I’ve tested it also on a server where the was already valid: no regression 
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Tested and it works. Before testing I copied back the original read file from /usr/libexec/nethserver/api/nethserver-mail/domains/read_ORIGINAL which braught back the error.
After installing I can confirm that it works. Check status -> dkim - ok
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