News for hackers. Stuff that matters.

A comment on Mailgun: Public Security Disclosure. Parent comment

Re:Mailgun: Public Security Disclosure by nickphx on Tuesday July 11, 2023 @11:48AM (#36682674)
Ehhh, mailgun is NOT relaying the mail.. Their MTA is accepting the message and re-publishing it via a webhook HTTP post to the mailgun user's configured webhook URL(s).
[ Parent | on HN ]
Re:Mailgun: Public Security Disclosure by elif on Wednesday July 12, 2023 @03:54PM (#36700744)
right... and if any single user's implementation has inbound mail cause outbound mail, merge variables or multiple RCPT lines will likely cause this user to be an arbitrary mail relay using that user's auth.
[ Parent | on HN ]
Re:Mailgun: Public Security Disclosure by nickphx on Thursday July 13, 2023 @01:17PM (#36712676)
Not sure how that would be the fault of mailgun or how spf/dkim validation enforcement on their end would help with poor design decisions of their clients.
[ Parent | on HN ]