On 2020-06-23 8:24 a.m., Alexander Dalloz wrote:
> Am 23.06.2020 um 07:33 schrieb Bernardo Reino:
>> If you use postfix a "workaround" is to temporarily disable
>> postscreen, which IIRC is the one (rightly) complaining about the
>> improper pipelining.
>>
>> Cheers,
>> Bernardo Reino
>
> No, submitting on SMTP port 25 would be the wrong step. There's
> submission on port 587 or submissions (formerly called smtps) on port
> 465 for taking MUA requests authenticating and submitting a message.
>
> Alexander
>

+1, you should even go farther and disable authentication on port 25


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