Please contact your hosting provider. Perhaps this is due to the fact your wrong written your DNS SPF record. Write to the address in the comments to verify your domain.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
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April 20, 2021: Q2A 1.8.6 released!