[swinog] Bluewin SMTP server reachable from outside bluewin/swisscom?

Hi,

(Possibly in relation to http://lists.swinog.ch/public/swinog/2021-March/007457.html, but in this case not even a TCP ACK...)

It seems smtp.bluewin.ch (25 and 465 tested) is unreachable from all places I checked (Init7, Quickline, BIT.nl).

Is that service normally open for Bluewin customers to connect to smtp.bluewin.ch?

As apparently Swisscom is sending out mails to providers that their customers are complaining that their customers on non-swisscom/bluewin cannot use their SMTP service.....

But telnet does not even answer.... (no TCP ACK at all, no ICMP, nada nothing), thus looks like it is firewalled away.

Greets, Jeroen