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A comment on Mailgun doesn't validate the email headers of email sent through their system. Parent comment

Re:Mailgun doesn't validate the email headers of email sent ... by pbhjpbhj on Saturday November 13, 2021 @12:27PM (#29211478)
Surely they can cut off emails before it reaches the SMTP server though? Don't they have a milter that drops email sent by accounts that don't have the domain registered? They don't really forward spoofed mail do they??
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Re:Mailgun doesn't validate the email headers of email sent ... by Asmod4n on Sunday November 14, 2021 @07:49AM (#29216902)
They do, they only check if you are allowed to log in.

Exchange even has a feature built in for exactly this, their send connectors can’t store more than one account.

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