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Issue Google put every mail into SPAM

The DKIM signature of this email was wrong (according to your screenshot), so what do you expect your server should be doing with this message?

What I don't really get, is what DMARC has to do here, as neither googlemail.com nor gmail.com have a DMARC record published.
Your own DMARC settings do not matter here....well maybe except if you sent the original email to a gmail.com address and there you have an automatic redirection for emails configured, that point back to an address hosted on your server.
 
Hi, first let me thank you for your quick reply.

Yes, you are right. It is expected, that the wrong DKIM should mark this email and also send it into spam.

What I can reproduce is, that if DMARC option on the Plesk Server is hooked "off" as shown in screenshot above, the mail with attachment lands in inbox.
If DMARC option for verifying incoming mails is "on", then mail goes into Spamfolder.

So I do not understand this:
I send a mail from this googlemail address with attachment and it is marked and lands in Spam.
I send a mail from this googlemail address withou attachment and it lands in Inbox.

Any Idea what is wrong here?
 
Just want to update with a solution for my problem!
Adding include:_spf.google.com to DNS TXT SPF helped to get rid of the problem.
All mails from googlemail.com with attachment know are landing into the INBOX.
 
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