15characterslon
Joined 8 years ago
Joined 8 years ago
Their engineering blog is full of articles about MySQL and the main "mysql1" database cluster, e.g. https://github.blog/2021-09-27-partitioning-githubs-relation...
Fixing this would only affect users who send emails "from" other users email addresses, basically users who commit fraud.
Please name even a single major mail provider that allows to send emails with arbitrary "from" headers.
https://datatracker.ietf.org/doc/html/rfc7208 https://datatracker.ietf.org/doc/html/rfc7489
Like you said: SPF and DMARC only authenticate the server. It's up to the server to authenticate the user.
Scenario: imagine your bank uses Mailbox.org to send emails. How would you verify that an email is legit? Any Mailbox user can send emails through Mailbox with your bank as "from" and all of these emails pass SPF and DKIM checks. Your mail server has no way to distinct a legit email from a fake one. This is why it's important that the server does this check (check that sender account and "from" match / are a valid combination).
What they said in the forum doesn't make much sense. Yes, anyone in the wold can send emails with any address as "from". The big difference is that those emails won't pass SPF and DMARC checks.
If I wanted to use them, I would need to configure SPF and DMARC for my domain so that their mail servers pass those checks. At this point I would expect their mail servers only to allow sending "from" my domain when my account is used.
Note that just about any major mail provider does this check (e.g. Google). It is industry standard. It is crazy that they even refuse to acknowledge this. I'm working in this field and this is basic knowledge. I just don't get how they can do this professionally and not understand what the problem is. The only explanation I have is that for some reason it would be hard for them to fix and so they try to ignore it / make it disappear by deleting the forum thread.
Also they use the same DMARC key for all customers, which is weird. Usually each customer gets it's own DMARC key.
There was a quite lengthy discussion about this in their forum but they deleted it since. They refused to fix it. Archive.org still has it. Content is in German (sorry):
https://web.archive.org/web/20210123192856/https://userforum...