Failed delivery to gmail account

[MJR1471]

Received a failed delivery notification, with reason given: 

550 5.7.26 Unauthenticated email from sky.com is not accepted due to domain's DMARC policy. Please contact the administrator of sky.com domain if this was a legitimate mail.

Anyone else experience this and know how to resolve?

Thanks

[Mark39]

For clarity, was this an email you sent from your Sky Yahoo Mail account? Or are you the Gmail recipient?

[MJR1471]

Well spotted! This was me attempting to send a Google calendar invite (via my sky yahoo mail account) to a Gmail user. 

Apologies for lack of initial info/clarity.

Thanks

[Mark39]

Hmm. It's not a regularly reported issue. A quick Google of the error  message suggests that Gmail considers this particular email to be coming from an unreliable source. I don't know enough about email systems to understand the suggested solution and I'm fairly confident Sky customer advisers wouldn't either, if you were to call them. If it were me, I'd try again, and if the same error recurred I'd look for an alternative way to send the email. Sorry.

[MJR1471]

Thanks. This is exactly the same position I came at it from. Sky doesn't allow sufficient settings access that would afford me the opportunity to follow suggested troubleshooting steps.

Will try again and, failing that, seek alternative method of sharing.

Many thanks