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Send-MailMessage : Mailbox unavailable. The server response was: 5.7.60 SMTP
Hi all, This forum really is my last option, cause I checked in the internet for a solution and was not able to find. I have a hybrid exchange scenario - Exchange2019 + O365 - all the mailboxes ...
Hi alavd, sorry for delay in responde.
I could fix the issue using the command Add-ADPermission, as I have an hybrid environment.
Something like:Add-ADPermission -Identity "Terry Adams" -User AaronPainter -AccessRights ExtendedRight -ExtendedRights "Send As"This example grants Send As permissions for Aaron Painter to Terry Adams's mailbox.
Source: https://learn.microsoft.com/en-us/powershell/module/exchange/add-adpermission?view=exchange-ps
Anyone?