Marcus Müller a.k.a. "Tethpub ZNeK"


Yes, it's about time for me to have a blog, too, I guess. I call this one a shoutblog, it's an XMPP bot I can easily talk (and hence post) to.


A friend of mine has a email address. Turns out, we're blocked by them: Connected to but sender was rejected. Remote host said: 550 5.7.1 Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (AS3140). You can also refer your provider to . []

That surprised me a bit, but what do I know? So, I went to see who else did blacklist us: Blacklist Monitor Report -

No one else. Oooookaaaaaayyyy?

So, I tried the URL given in their SMTP response . I don't see any reason for blocking us, as none of their error codes is stated here. We also use SPF:

$ host -t TXT descriptive text "v=spf1 ip4: a mx -all"

After a bit of searching I came across Office 365 Anti-Spam IP Delist Portal

Fun fact: This site sends a confirmation email which is dropped by our (very standard) SpamAssassin with a score of ~11.x (5.0 being required for being identified as spam). 🤦

Some more digging around led me to the Microsoft community forums, i.e. Delist IP from Hotmail Block List … my overall impression of the discussion is this: Microsoft's blacklisting process is utterly intransparent and they don't have any working process in place to help you getting delisted - if that's possible at all, which seems to be highly questionable.

Now that's what I call a Hacker. I fail to see what's so special about this guy, though. :-p

It's been 3 years now that I switched from my former EBS TD 650 amp to a Kemper Profiler Power Rack .

Regarding equipment, that decision was one of the best I made. There are already a lot of positive testimonies spread all over the Internet regarding the switch to Kemper, mostly regarding its spot on sound compared to the profiled amps, and I certainly won't object here.

However, what's also extremely great and which doesn't get mentioned that often, is its exceptional range of high quality effects. From noise gate to EQs, boost and distortion, flanger, chorus, etc. almost everything is top notch quality.

One must also point out how well thought the user interface is! Every refinement to it (there are constant upgrades) is also an improvement. Most of the time these improvements tend to suprise me, as they ease certain aspects that I didn't find lacking, but which address these aspects in a way that make them even more accessible.

Recently, I got a Profiler Remote which is yet another testimony to the exceptional quality Kemper delivers. Apart from its sturdy construction, using PoE for having just one cable to care about isn't just great, it's perfect engineering.


ZSTD compression for ZFS looks very promising, apart from the fact that the throughput is much higher compared to gzip compression at similar compression ratios. We have a use case for even the highest compression settings, where we store data only once but read it often - the fast decompression throughput for reading makes this feasible.


Winter is coming! (that's kinda old, agreed) …Erik told me to avoid snowflakes at any cost, instead go phoenix. I sort of agree. But can I? For the time being, it's Ansible (and maybe Serverspec). I'll also need to have a look at BSDploy, as I'm really digging BSD jails (+ ZFS, yay! End of all troubles!).

Height:165 cm
Weight:73.0 kg
Tattoos:not a single one
Piercings:not even that
Occupation:Independent IT contractor, Musician


Popular software
iTunesFS 1.3.6

Werder Bremen - Borussia Dortmund
Sunday, April 29, 2018 18:00 CEST
(in 2 days)

Fortune cookie
"Given the choice between accomplishing something and just lying
around, I'd rather lie around. No contest."
-- Eric Clapton
another cookie!