Emails sent to Hotmail and Outlook accounts just disappear how can we - Microsoft Community

hello,
of late more , more emails sent users hotmail or outlook accounts users of our email server disappear. our email server's log files declare emails sent, never arrive @ destination.
yes, have checked sps settings of sending domains , have reverse lookup our mail server. registered 'smart network data service' , regularly check email server blacklists, etc.
affecting our customers , customers using microsoft email services business or other transactions.
our mail server has address: 87.106.138.102 (mail.fsnd.de)
examples of sending domains are: ateahrealty.com, the-native-translator.com , eastshorerealty.ca

according to: https://www.talosintelligence.com/reputation_center/lookup?search=87.106.138.102 our email reputation good!

please inform have let our customers send customers legit emails.

kind regards
fredrick buetefuer

hello fredrick,

there lot of possible causes why recipient didn't receive emails, here following:

• recipient have receive emails in junk folder
• check inbox filter , sort settings
• the email might blocked receiver
• email rules

for better assistance, we'd ask following:

• are using office 365 business? know office product, check here.
  
• what other troubleshooting steps have tried?
• did make changes outlook , hotmail settings before experiencing issue? if yes, we'd ask additional information.
• is isolated case? if no, how many users affected?

we looking forward reply.

Outlook.com / Email / Sending, receiving, and reading email