Am 27.09.2023 schrieb "\"Support\"" ([email protected]) <[email protected]>:
> <[email protected]>: host > msn-com.olc.protection.outlook.com[104.47.59.161] said: 550 5.7.1 > Unfortunately, messages from [185.223.74.125] weren't sent. Please > contact your Internet service provider since part of their network is > on our block list (S3140). That is not related to SOGo at all. You send the mails out from 185.223.74.125. That host seems to be or has been on a blacklist MS uses. https://docs.hetzner.com/de/robot/dedicated-server/troubleshooting/microsoft-blacklist/ https://olcsupport.office.com/ is named as a place where you can delist it. Question 1: Is 185.223.74.125 your system or do you relay it through another SMTP server (often called smarthost)? If it is yours and only controlled by you: Check the logs for any spam message
