Hey,
i am not sure if that is directly related to you problem, but t-online.de is one of the worst email providers i have ever seen. They eandomly block you for no reason. Last month i got bocked because the hostname of my email server did not contain the word "mail". They demandet that all of the sudden. Then they only accepted emails from my servers if on the same IP as the mailserver there was a websever that served a valid impress/legal notce. Totally nuts that t-online.de company.

Meybe this helps you a bit.
Greetings
Leo

On 03/11/2021 14:38, Manfred Lotz wrote:
Hi there,
Could a msgid cause problems insofar as their content might be seen as
an indicator that the mail is SPAM?

My situation: I have a couple of email providers, where I send mails
from.

In Opensmtp I have something like this

...
action "posteo.de"   relay host smtps://[email protected] auth <secrets>
action "t-online.de" relay host smtps://[email protected] auth 
<secrets>
...

Now when sending mail as manfred.lotz at posteo.de or manfred.lotz at
t-online.de the msgid always contains the local hostname which is
simply hogwart in /etc/hostname. My laptop is not registered with a dns
lookable server name.

Question: Is there a possibility to tell opensmtp to create a msgid like
    [email protected]>
instead of
    ed8c9804c3dda99d8207f4ae945cddcf@hogwart>

when I send mails with From: manfred.lotz @ posteo.de?

Same for the other account.


Thanks.



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