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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