This case was verified by the management team Nobody has yet confirmed the case. Feel free to do it
Port 25 (SMTP) is blocked both incoming (preventing the use of domains to receive mail on other that providers) as well as outgoing only through the providers mail servers.
It is just blocked.
Before Ziggo was bought by UPC we had a mailserver on the line concerned. After the UPC / Ziggo deal was final suddenly it didn't work anymore...
According to the Helpdesk it could never had worked..?? It clearly did for us a few years.
Nico - 03/23/2016
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