When out of office is enabled. The users from gmail doesn't receive the out of office notification.
In message trace we get this Fail error:
Reason: [{LED=550-5.7.26 Unauthenticated email from <MY DOMAIN> is not accepted due 550-5.7.26 to domain's DMARC policy.
Please contact the administrator of 550-5.7.26 <MY DOMAIN> domain if this was a legitimate mail.
Please 550-5.7.26 visit 550-5.7.26 https://support.google.com/mail/answer/2451690 to le. OutboundProxyTargetIP: XXX.XXX.XXX.XXX.
OutboundProxyTargetHostName: gmail-smtp-in.l.google.com
