Tag: Postfix

Solve Microsoft Email Block List Errors Instantly

Microsoft 550 5.7.1 S3150 block list error

Hosting your own email server and getting block list related “Undelivered Mail Returned to Sender” errors (e.g. S3150) for Microsoft hosted email domains like hotmail.com? Read on to find out how to reliably work around this issue quickly.

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Postfix: suppress authenticated sender name in header

For different reasons I use a lot of alias email addresses. But do they really work like I think they should?

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