Le 23 avril 2021 11:11:56 GMT+04:00, Sean Kamath <[email protected]> a
écrit :
>> On Apr 22, 2021, at 13:01, ED Fochler <[email protected]> wrote:
>>
>> No.
>>
>> You're only trying to send mail. Your ISP is only trying to stop you from
>> sending mail.
>>
>> Mail delivery is meant to be very well defined and easy to identify. If
>> your ISP is blocking connections to port 25 then they are blocking all mail,
>> spam and otherwise. The solution is to set up a mail server on a network
>> that allows mail. This can be a $5/mo cloud server. You can then 'submit'
>> mail to your mail server using other ports, but the mail server will talk to
>> other mail servers on standard ports, primarily port 25.
>
>So, I actually have this same problem.
>
>I do have a VPS, which is my mail server (and have no problems sending mail,
>such as this one, using my MUA to connect to the VPS-based MTA). I have about
>8 little PCEngines Alix and APU devices, all sitting at home, with an ISP that
>blocks port 25 (and lord do I wish I had the option for another ISP). They
>all run OpenBSD/OpenSMTP.
>
>The problem I’ve run into is I’m not sure how to use the submission port to
>“submit” mail to my mail server. Since I have the cron emails being sent, how
>do I get those routed to the VPS? How do I get basically all the emails for a
>couple of users forwarded to the VPS without, you know, relaying mail?
>
>Do I set up an account on the VPS, and tell SMTPD to relay all mail to my
>domain to that submission port? That sounds like relaying, and, as stated
>elsewhere in this thread, "Emails must be relayed on port 25.”
But relaying to a controlled host, which is nothing like the original issue.
>Back in the before-times, I used sendmail’s concept of a smarthost, and just
>pointed it at that host, and could also tell it what port to connect on.
>
>I’m fine with “you can’t relay on any port other than 25”, but then how do I
>get the mails the system generates to my mailserver running on the VPS?
>Frankly, I think it’s kinda an odd restriction that you MUST use port 25 to
>relay mail between hosts if you own both hosts.
Yes that would be odd, but this restriction does not exists thanksfully.
>If I want to use port 2525, I should be able to the one MTA to relay to the
>other MTA on this IP:port combination. I get that OpenSMTPD doesn’t have this
>ability, but I don’t see what this breaks if it’s allowed.
OpenSMTPD does have this ability, as Demi Marie Obenour pointed out. ;)
