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Unable to receive mail from certain addresses


Hello I have a domain registered with OVH. I’m currently hosting my website on Netlify.
I’ve also configured some email redirections from OVH to a Gmail account. I have MX Plan 1.

This is the message that some of my senders are getting while sending emails:
This is the mail system at host

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

********* host[]
said: 550-5.7.26 This message does not have authentication information or
fails to 550-5.7.26 pass authentication checks. To best protect our users
from spam, the 550-5.7.26 message has been blocked. Please visit 550-5.7.26 for more 550
5.7.26 information. g5-20020a5d64e5000000b0020c829ce30fsi11949933wri.949 -
gsmtp (in reply to end of DATA command)

where ***** is my other gmail address.

My DNS zone is configured in Netlify account as following: 3600 IN MX 1 3600 IN MX 5 mx1. 3600 IN MX 50 3600 IN MX 100 3600 IN MX 200 3600 IN NETLIFY 3600 IN NETLIFY 3600 IN TXT v=DMARC1; p=none; 3600 IN TXT v=spf1 ~all

mydomain is just an example domain.

I’m assuming that the DMARC record is correct because if I test mydomain with some MX Tools, it get verified correctly.

So why am I getting this error??

Below there is a detail of the error directly from Gmail help guide:
550, “5.7.26”, " Unauthenticated email from domain-name is not accepted due to domain’s DMARC policy. Please contact the administrator of domain-name domain. If this was a legitimate mail please visit Control unauthenticated mail from your domain to learn about the DMARC initiative. If the messages are valid and aren’t spam, contact the administrator of the receiving mail server to determine why your outgoing messages don’t pass authentication checks.

I’ve missed some important emails, and I can’t figure out why this happens only from certain senders, which by the way are not blocked by Gmail, because if they send emails directly to my Gmail address, there are no problems…

Please advise some help


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