[Users] [Bug 4601] New: gmail no longer supports "insecure" client

[Paul]

On Mon, 20 Jun 2022 14:06:24 +0100
Abrolag <abrolag at users.sourceforge.net> wrote: 

> I've attached an entire (returned) test message - including all headers.
> If someone here can make sense of it I'd be very grateful.

The mail server you are sendng your mail through needs to set up DomainKeys
Identified Mail (DKIM) and/or Sender Policy Framework (SPF).

These are authentication mechanisms used by mail servers.

https://en.wikipedia.org/wiki/Dkim
https://en.wikipedia.org/wiki/Sender_Policy_Framework

This (also) is not on topic here.

with regards

Paul