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If you run a mail server you are obligated to have a working postmaster account

@sir it seems even companies doesn't do that right.
Sadly I don't know everyone everywhere who handles SMTP related issues so sometimes I need to hold of someone on the other end.
More often than not this involves calling their support line and talking to first line support. The poor people there are rarely able to help.
I have found the trick though.
1. Call and open a ticket
2. Send a packet dump (of anything it doesn't matter)
3. Tell them that if they just check the packet dump it will be evident what is wrong.
This will get the case escalated to some senior person who knows who handles SMTP.
@sir Yes. And google will send you daily DMARC reports whether you want/need/ have asked for them or not
@sir And if you have a domain, root@ should be working (among other things).
@lanodan @sir why root@? Don't see the point.

We have postmaster / hostmaster for the individual services, use those
@reto @sir You might not have an idea of which service is involved or there might be no service involved on their side.

For example a bot that doesn't understands rate-limiting.

@sir i am lazy, just use wildcard for my domains

but don't run a mailserver. doing it right is not easy

@sir If your land contains a pond with waterfowl you must maintain a duckmaster account

@sir
Is anyone truly the master of the post at this point?

@sir I usually collect all root, admin, administrator, webmaster, postmaster mail into one account and all non-user mail into another which is good for an instructed spamfilter on one hand and on the other for me to see what the internet is trying to do with my server.

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