Linode blocks port 25 on all new accounts/servers. You need to talk to them and 
explain who and what you are, before they open it manually for you.


On Thu, 21 Jan 2021 16:29:56 +0000 Gregory Heytings via mailop 
<mailop@mailop.org> wrote:

> How can a server provider do this?  Apart from blocking port 25 of course, 
> and forcing all emails of their customers to go through their SMTP server, 
> in which case they wouldn't be selling a bare machine anymore.  If it was 
> "not even that difficult", I'd guess they would all do it.
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