Good afternoon,

I need some help.

I created a SMTP Virtual server for relay emails send by multiples machines in our infrastructure to Gmail SMTP.

Our domain = global.corp.

Email domain = company.fr ( fake , of course ).

So all emails with a sender "@company.fr" can be relay to the Gmail SMTP by this SMTP internal server , and we receives emails in our mailbox.

My issue appears when the sender is another domain , for example emails sent by our Cisco server "@cisco.global.corp " ( domaine names are not reals but it's just an example ).

Gmail rejected emails by this domain , even if we changed the security for allow them on Admin Google portal.

We can change the domain smtp name in the Cisco server but they will have a lot of issues.

Maybe someone already have this issue and know how to resolve it easily.

Best regards,