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I have a problem, all mails from my domain (lcs-proprete.fr) to GMAIL users only go to their spam folder. SPF is ok, DKIM is okay and DMARC is configured as p=none

I disable dkim to be sure that the problem does not come from that but don't change anything. I reactived DKIM and tried to rotate the DKIM keys on the Microsoft 365 portal and via Powershell (Rotate-DkimSigningConfig), i also tried to change the KeySize to 2048.

I check on the net and i see a lots of domain have this problem, and I tried everything I saw but nothing change. i sent a mail to google support one week ago but no answer.

need help please

have a nice day :D

Sylvain Arumugam
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    There are other sources of possible errors. Check if the HELO name resolves to the IP address used by your SMTP, and if the reverse is the same as the HELO name. The mail can be flagged as spam because of its content. The IP address could be in blocklists or have a bad reputation. You can check these points with https://www.mail-tester.com/ – Dylan Jul 07 '22 at 12:08
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    Does this answer your question? [Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?](https://serverfault.com/questions/419407/fighting-spam-what-can-i-do-as-an-email-administrator-domain-owner-or-user) – Gerald Schneider Jul 07 '22 at 12:31
  • Use this link to check how Google validates your domain. https://toolbox.googleapps.com/apps/checkmx/check?domain=lcs-proprete.fr&dkim_selector= – user10186832 Jul 22 '22 at 21:00

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There are various tools including https://mxtoolbox.com/deliverability that are all available online to test both the emails themselves and also the server setup, that should show up the problem.

If everything shows OK it might simply be that lots of people have marked emails from your IP address as SPAM, and if you have an IP from a service provider, it might have been previously used to send SPAM, in which case you need to get another one.

GMail will sometimes tell you why the message is in the spam folder and if you choose "Show Original" on the message, the information at the top will often show up any issues with the message itself.

Luke Briner
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