23 May
2021
23 May
'21
4:16 a.m.
peter@chubb.wattle.id.au writes:
Also check your firewall rules.
This is a good idea, although it seems unlikely in this case.
Outgoing port 25 is usually blocked by ISPs unless you explicitly ask for it not to be.
I don't think this is likely because the OP did say it seems to be only this one host, and ISPs generally block generically.
Steve