you can use this Google APP https://postmaster.google.com/managedomains also you can use DKIM and or SPF verification

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El 01/02/2019 a las 15:41, Enrico Morelli escribió:
Dear all,

I having some problem forwarding some emails to Gmail addresses.
Sometime the emails are bounced cause:

This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam,
the 550-5.7.1 message has been blocked. Please visit 550-5.7.1
https://support.google.com/mail/answer/81126#authentication for more
550 5.7.1 information. k11si3359248wrp.39 - gsmtp (in reply to end of
DATA command))

I'm sure that these emails aren't spam.

Someone can explain me why? Is there some misconfiguration in my mail
server?

Thanks


Attachment: smime.p7s
Description: Firma criptográfica S/MIME

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