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Group Email by Domain Users
I recently switched from GSuite/Google Workplace. Google was fairly easy to administer and I'm finding Microsoft a little more difficult. In Google, I could easily create a distribution group an...
Either Dynamic DG or O365 Group would do, the problem is that *everyone* can send messages to it once you toggle the flag. To restrict this, the best option would be to use Mail flow rules, as they give you a lot of freedom in terms of conditions you can use to "match" the sender.
What you are asking for is the default behavior in O365, for both "traditional" distribution groups and "modern" Office 365 groups. There's no need to configure anything.
VasilMichev I continue to get NDRs when sending a message to one of these groups. It is just a Unified or new distribution group.
Here is the distribution list config in case I have inadvertently configured it incorrectly.
I appreciate the help
RunspaceId : 2a2eaf8e-7422-4792-bd80-a6bb8a520a3d AccessType : Private AuditLogAgeLimit : 90.00:00:00 AutoSubscribeNewMembers : True AlwaysSubscribeMembersToCalendarEvents : True CalendarMemberReadOnly : CalendarUrl : https://outlook.office365.com/owa/?pat h=/group/*******/calendar Database : NAMPR19DG029-db093 ExchangeGuid : 78c028d9-4bb9-4760-bcc2-99de1e5902a0 FileNotificationsSettings : GroupSKU : Default InboxUrl : https://outlook.office365.com/owa/?pat h=/group/********/mail IsExternalResourcesPublished : True IsMailboxConfigured : True Language : en-US MailboxProvisioningConstraint : ManagedByDetails : {*****} Notes : PeopleUrl : https://outlook.office365.com/owa/?pat h=/group/******/people PhotoUrl : https://outlook.office365.com/EWS/Exch ange.asmx/s/GetUserPhoto?email=******* ServerName : mn2pr19mb3007 SharePointSiteUrl : SharePointDocumentsUrl : SharePointNotebookUrl : SubscriptionEnabled : True WelcomeMessageEnabled : True ConnectorsEnabled : True IsMembershipDynamic : False Classification : GroupPersonification : YammerEmailAddress : GroupMemberCount : 17 MailboxRegion : GroupExternalMemberCount : 0 AllowAddGuests : True WhenSoftDeleted : HiddenFromExchangeClientsEnabled : False ExpirationTime : DataEncryptionPolicy : ResourceProvisioningOptions : {} ResourceBehaviorOptions : {} ServiceEndpointUris : {} SensitivityLabel : InPlaceHolds : {} EmailAddresses : {smtp:******* , SMTP:*******} PrimarySmtpAddress : ******** Name : all_4c001ab1-f883-41b9-8fc9-26765a852f b9 DisplayName : All Staff RequireSenderAuthenticationEnabled : True ModerationEnabled : False SendModerationNotifications : Always SendOofMessageToOriginatorEnabled : False BypassModerationFromSendersOrMembers : {} ModeratedBy : {} GroupType : Universal IsDirSynced : False ManagedBy : {****} MigrationToUnifiedGroupInProgress : False HiddenGroupMembershipEnabled : False ExpansionServer : ReportToManagerEnabled : False ReportToOriginatorEnabled : True Description : {} BccBlocked : False AcceptMessagesOnlyFrom : {} AcceptMessagesOnlyFromDLMembers : {} AcceptMessagesOnlyFromSendersOrMembers : {} AddressListMembership : {\Default Global Address List, \GroupMailboxes(VLV), \All Recipients(VLV), \Groups(VLV)…} AdministrativeUnits : {} Alias : all OrganizationalUnit : nampr02a003.prod.outlook.com/Microsoft Exchange Hosted Organizations/****** CustomAttribute1 : CustomAttribute10 : CustomAttribute11 : CustomAttribute12 : CustomAttribute13 : CustomAttribute14 : CustomAttribute15 : CustomAttribute2 : CustomAttribute3 : CustomAttribute4 : CustomAttribute5 : CustomAttribute6 : CustomAttribute7 : CustomAttribute8 : CustomAttribute9 : ExtensionCustomAttribute1 : {} ExtensionCustomAttribute2 : {} ExtensionCustomAttribute3 : {} ExtensionCustomAttribute4 : {} ExtensionCustomAttribute5 : {} GrantSendOnBehalfTo : {} ExternalDirectoryObjectId : 4c001ab1-f883-41b9-8fc9-26765a852fb9 HiddenFromAddressListsEnabled : False LastExchangeChangedTime : LegacyExchangeDN : /o=ExchangeLabs/ou=Exchange Administrative Group (FYDIBOHF23SPDLT) /cn=Recipients/cn=0c641af02a094c2eb7b1 a3ce470a8036-all_491d5d3 MaxSendSize : 35 MB (36,700,160 bytes) MaxReceiveSize : 36 MB (37,748,736 bytes) PoliciesIncluded : {} PoliciesExcluded : {{26491cfc-9e50-4857-861b-0cb8df22b5d7 }} EmailAddressPolicyEnabled : False RecipientType : MailUniversalDistributionGroup RecipientTypeDetails : GroupMailbox RejectMessagesFrom : {} RejectMessagesFromDLMembers : {} RejectMessagesFromSendersOrMembers : {} MailTip : MailTipTranslations : {} Identity : all_4c001ab1-f883-41b9-8fc9-26765a852f b9 Id : all_4c001ab1-f883-41b9-8fc9-26765a852f b9 IsValid : True ExchangeVersion : 0.10 (14.0.100.0) DistinguishedName : CN=all_4c001ab1-f883-41b9-8fc9-26765a8 52fb9,OU=*****, OU=Microsoft Exchange Hosted Organizat ions,DC=NAMPR02A003,DC=prod,DC=outlook ,DC=com ObjectCategory : NAMPR02A003.prod.outlook.com/Configura tion/Schema/Group ObjectClass : {top, group} WhenChanged : 12/11/2020 11:32:43 AM WhenCreated : 12/3/2020 11:58:37 AM WhenChangedUTC : 12/11/2020 4:32:43 PM WhenCreatedUTC : 12/3/2020 4:58:37 PM ExchangeObjectId : ebc6953a-f46a-4aed-ab54-ea71ca494863 OrganizationId : NAMPR02A003.prod.outlook.com/Microsoft Exchange Hosted Organizations/***** - NAMPR02A003.pr od.outlook.com/ConfigurationUnits/*****/Configuration Guid : ebc6953a-f46a-4aed-ab54-ea71ca494863 OriginatingServer : SN6PR02A03DC004.NAMPR02A003.prod.outlo ok.com ObjectState : ChangedI should also note that the messages being rejected are being sent by an automated system sending via Sendgrid.
Based on your original question, I thought you *didnt* want external messages to the group? If you do want to enable this, toggle the RequireSenderAuthenticationEnabled flag. If you want to only allow messages from specific external addresses, best create a Mail flow rule.
