On 19.10.19 10:06, The Natural Philosopher wrote:
> On 18/10/2019 19:10, Tauno Voipio wrote:
>> On 18.10.19 13:24, Roger Bell_West wrote:
>>> On 2019-10-18, Richard Kettlewell wrote:
>>>> Can you see what happens in the SMTP connection? At the least you need
>>>> to establish whether Exim is attempting to authenticate and failing, or
>>>> not even trying.
>>>
>>> FWIW I've seen perfectly standard email to gmail.com addresses
>>> rejected with this specific error in the last few weeks. It's just
>>> gmail being big enough not to have to care.
>>
>>
>> Gmail is using a black hole list, maybe RBL. If your ISP's
>> sending MTA gets on the list, your mail will be delayed or
>> rejected.
>>
>> Been there, maybe even now.
>>
> Its worse than that.
>
> I needed to fake an email fr a friuend who was sitting beside me ta the
> time. To send off a large dicument I had hlepned him preprae.
>
> No problem I thought, I can fake his BT email account and send it
> through my own SMTP relay.
>
> No chnace. the target systenm rejected it in te grounds that BT email
> doesnt get sent from random relays on the internet.


This is just the reason why the ISP mail agent is so important.
IIRC, there is an EU recommendation that consumer accounts should
be allowed to send email via licensed ISP servers only.

This at least makes it more difficult to fake emails (which we
have far too much of in the current Net).

--

-TV

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