Sometimes an exchange mailbox not accept messages from one specific email, and show this message: “smtp 554 5.1.0 Sender Denied”

to see why the sender is not allowed , you can use this ps commands:

Get-MailboxJunkEmailConfiguration mailbox@domain.com

 

you can see some like this:


RunspaceId : dd2b6ece-da6d-4386-ad98-2b0959d3a258
Enabled : True
TrustedListsOnly : False
ContactsTrusted : False
TrustedSendersAndDomains : {admin11@capifer.com, albertsc74@hotmail.com,...}
BlockedSendersAndDomains : {abril11@publitoner.eu, admin2@cic.fr, ...}
MailboxOwnerId : infoservei.es/Infoservei/Empreses/FontSans/Font-Sans S.A. (info)
Identity : infoservei.es/Infoservei/Empreses/FontSans/Font-Sans S.A. (info)
IsValid : True

Then you can check if the email is on BlockedSendersAndDomains, and remove it:

Set-MailboxJunkEmailConfiguration info@fontsans.com -BlockedSendersAndDomains @{remove="abril11@publitoner.eu"}

 

 

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