I can't send email since 3 days

I’m trying to send email from my mobile or from the web interface murena.io
and it’s not working.
I can receive emails.
I try with an other email address e.email and everything is working fine.
I don’t know what can I do


it’s working if I use the same address email with @murena.io instaed of @e.email without changing other parameters
very strange

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