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.

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-TV

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