Sometimes when I try to send a mail to microsoft domain address I can see in exim4 mainlog lines like this : eur.olc.protection.outlook.com address already in use After hours or days in the exim4 queue, the mail has sent and sometimes client didn't receive it.

And Sometimes when I try to send a mail to another domain like gmail.com I can see line like this : address_mail_to R=dnslookup_users T=remote_smtp defer (-53): retry time not reached for any host

I have tried this solution quick fix it' works but the problem comes back again and again, I would like to fix this problem really


you could check guideline in below page to troubleshoot, if it is still experiencing deliverability issues, you could contact Outlook.com deliverability support.


Outlook.com Deliverability Support


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