On Mon, Jul 29, 2024 at 12:16:20PM +0200, export--- via Postfix-users wrote:
> Sent email returns with the error
>
> #5.7.0 Must issue a STARTTLS command first (in reply to MAIL FROM command)
>
> How can I correct that error?
> Thank you for help
Since you're asking on the posfix-users list, presumably you're
operating a Postfix MTA that is attempting and failing to send the
message in question.
If so, it would typically suffice to enable outbound TLS support:
smtpd_tls_security_level = may
However, some remote systems are poorly operated, and both:
- Fail to offer STARTTLS in their EHLO response to clients.
- Refuse incoming mail unless it is delivered via TLS.
Such conflicting requirements are impossible to work around on the
client end. The server is broken, and must be fixed by its operator.
It is not possible to be more specific about your situation, since
you've provided insufficient information.
https://www.postfix.org/DEBUG_README.html#mail
See also:
https://github.com/vdukhovni/postfix/tree/master/postfix/auxiliary/collate
which makes it easier to collect the complete set of events related to a
message of interest.
--
Viktor.
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