Create user mailboxes. Valid values are: The RemoteIPRanges parameter specifies the remote IP addresses that the Receive connector accepts messages from. The default value is 8. The mailbox setting is authoritative because the rule is if the mailbox setting is a numeric value then use that. Well good news, as Exchange Online Administrator you now have the agility to define your own recipient limit for your users - from 1 to 1000 recipients per single message. Agree with GDaddy, it seems a number limit of the recipient blocked these emails, try to run the following commands to check these limits: Powershell. For example, the value 64 MB results in a maximum message size of approximately 48 MB. Each directory can independently process message files at this rate. IP address range: For example, 192.168.1.1-192.168.1.254. The default value is 256 kilobytes (262144 bytes). In the result pane, select the mailbox for which you want to restrict the number of recipients per message. 2 percent on other Receive connectors on Mailbox servers and Edge Transport servers. This is the default value. $false: The client isn't required to provide a domain name in the EHLO handshake. This setting also requires that you set the UseDownGradedExchangeServerAuth parameter to the value $true on the Set-TransportService cmdlet on the server. Organizational limits apply to all Exchange 2019 servers, Exchange 2016 servers, Exchange 2013 Mailbox servers, and Exchange 2010 Hub Transport servers that exist in your organization. The default value is 5, to configure it to 2 we can use the following cmdlet: Set-ReceiveConnector <Connector Name> -MaxProtocolErrors 2. This parameter uses the following syntax: "Domain1:Capability1,Capability2,","Domain2:Capability1,Capability2,", You can only use this parameter in Exchange hybrid deployments, and the valid Capability values are: More Capability values are available, but there is no scenario to use them. Setting the value to more than a few seconds can cause timeouts and mail flow issues. To specify a value, enter it as a time span: dd.hh:mm:ss where dd = days, hh = hours, mm = minutes, and ss = seconds. The BareLinefeedRejectionEnabled parameter specifies whether this Receive connector rejects messages that contain line feed (LF) characters without immediately preceding carriage return characters (CR) in the SMTP DATA stream. Maximum number of recipients in a message file placed in the pickup directory: 100. . We strongly recommend that you use Extended Protection for Authentication if you are using Integrated Windows authentication. This is the default value. The default value is 5 seconds. Valid values are: If the email address specified in the ORAR information is a long X.400 email address, you need to set the LongAddressesEnabled parameter to the value $true. Accessibility. $true: Inbound messages on the Receive connector require TLS transmission. The MaxAcknowledgementDelay parameter specifies the period the transport server delays acknowledgement when receiving messages from a host that doesn't support shadow redundancy. $false: The Receive connector is disabled. You can apply these limits to your entire Exchange organization, to specific mail transport connectors, specific servers, and to individual mailboxes.
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