Marco Moock writes:
Am 16.07.2025 um 15:18:28 Uhr schrieb Frank Bures: > mtr --tcp -P 587 -6 smtp.gmail.com > > returns: > > mtr: udp socket connect failed: Network is unreachable Indicates that something is faulty. Leave -6 out, it will default to IPv6. If not, something other is faulty.
I've had these kinds of reports come in, occasionally, for many years: for one reason or another someone's IPv4 connectivity is brokez, or someone's IPv6 connectivity is brokez, on a host-by-host basis. This is not knew. This is modern life on the intertubes.
In most cases nobody wanted to waste their time figuring out what the "something" of the "something is faulty" actually is, and just asked for a configuration switch to always use IPv4, or always use IPv6. So that's what I did.
I'm not familiar with sendmail, but you might want to look into it. If sendmail has a similar switch it might save a lot of time, sweat, and tears, to just flip the switch.
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