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"421 4.7.0 Error: too many connections""550 5.7.1 Message rejected as spam by Content Filtering""Mail sent to the wrong Office 365 region" when relaying to other O365 tenants"Only Senders Inside My Organization" settings with DG and allow mails from applications420 4.2.0 Recipient deferred because there is no Mdb421 4.7.0 [TSS04] Messages from "pubilc IP" temporarily deferred due to user complaints - 4432 4.3.2 STOREDRV.Deliver; dynamic mailbox database throttling limit exceeded451 4.4.0 SMTPSEND.SuspiciousRemoteServerError; remote server disconnected abruptly451 5.7.3 Cannot achieve Exchange Server authentication452 4.3.1 Insufficient system resources532 5.3.2 STOREDRV.Deliver; Missing or bad mailbox Database property550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain552 5.3.4 Message size exceeds fixed maximum message size (Config looks OK)552, 5.3.4 Header size exceeds fixed maximum size554 5.3.4 Content conversion limit exceededAdding third party vendor in our SPF recordsALL mail flow stopped on Exchange 2016Allow file types in attachments with Exchange 2016 on-premiseAttachment size restriction on mobile devicesAuto-reply email as if an user/email address never existedAutomatic deletion of Send Items send from a Shared Mailbox.ClientInfoString AND ACTION=viaproxy. wHat it means?Create a internal ConnectorCreating extra connection for idle queue Event ID: 8019 Source: MSExchangeTransportDefault FrontEnd Receive Connector - Modify?delete emails from archive mailboxDifferences between Smart Host and MX Record Exchange 2016Disable all Outlook Access unless Connected to Corporate Network or VPNDMARC test fails on out of office replies, but not on regular e-mailsDrain the mail queues on the serverdynamic mailbox database throttling limit exceededEdgeSync - LDAP Server is unavailable.emails stuck in "undefined queue" after changing send connector on Exchange 2016 CU9Enable HTTP Strict Transport Security (HSTS) on exchange serverEvent ID 36871 A fatal error occurred while creating a TLS client credential. The internal error state is 10013.Event Sends to Additional Account for Which Recipient is OwnerEXCH 2016 - Distribution Group (list) cannot receive Read Receipts: “messages of this type are not delivered to groups” Set-DistributionGroup -ReportToManagerEnabled $true not workingExchange mail flow issueExchange 2010/2013/2016 - DKIM setupExchange 2016 - Mails stuck in outboxExchange 2016 - Trying to figure out an email delay (250 2.0.0 Resetting)Exchange 2016 Block IP after too many Failed Login AttempsExchange 2016 CU11 Antimalware Automatic update failsExchange 2016 email relay with F5 LBExchange 2016 Hybrid - Message size restriction on Remote mailboxExchange 2016 not receiving some messages "452 4.6.0 Insufficient system resources (I/O)"Exchange 2016 SMTP Relay Error 451 4.7.0 Temporary server error. Please try again later. PRX5exchange hybrid emails are journaled twiceExchange mail receiving delayedExchange Migration 2010 to 2016 no mail flow between serversExchange Server 2016 - Remote(ConnectionReset)Exchange Server 2016 | Google Domain/Cloudflare - Unable to send some emailExchange Server 2016 451 4.4.0 DNS query failed. the error was:SMTPSEND.DNS.NONEXISTENTDOMAIN DOMAINExchange server 2016 CU6 Disable SSLv2, SSLv3, and TLS 1.0.Exchange Server 2016 CU9 EdgeTransport Service high CPU and Memoryexchange transport certificate issueExport Mails in .eml formatExternal Mails to Distribution Groups not sent to External Contacts due no AdressRewritingFind the source IP of an e-mailGetting error: No SMTP server defined. Use real server address instead of 127.0.0.1 in your account.Hiding Disclaimer in PreviewHow to configure Exchange Server 2016 DKIM configurationHow to configure S/MIME in Exchange Server 2016?How to deny or block email Undeliverable message fromHow to disable user anonymous send message use telnetHow to get the most information out of message trackingHow to hide Exchange Info and İnternal IP discloure in E-mail HeaderHow to put a line break in a DisclaimerHybrid Exchange 2010 - 2016 - Exchange Online.I have same email ID on two different servers.IIS log show cs-username is blank and sc-status is 401Imap Unhealthy/ ssl error / connection error to IMAP / Exchange 2016Internal Mail Flow Issues (Test-MailFlow Result *FAILUR*)LED=451 4.4.397 Error communicating with target host 421 4.4.2 connection dropped due to TimedOutLED=451 4.4.397 Error Communicating with target host.-> 421 4.4.2 connection dropped due to ConnectionResetMail Flow Rule IssueMail routing with Partner ConnectorMail rule to stop phishing message with fraudulent DisplayName and external addressMailtips enabled for external recipientsmaximum size of pst fileMessage :DROP routing .. on Dynamic Distribution GroupMessage Tracking Log ConnectorIDmessage with restricted permission cannot be viewedMessage-tracking data on server mx.domain.local had invalid data in column 12 for this message. Event "THROTTLE" will be ignoredMessage: Mailbox unavailable. The server response was: 5.7.54 SMTP; Unable to relay recipient in non-accepted domainMessageInfo field referencemessages sent sitting in a 'Pending' status and not being received.Microsoft Exchange Approval AssistantMicrosoft Exchange Transport service is rejecting messagesmicrosoft filtering service wont startMicrosoft Office365 Mailprotection Antispam HeadersNDRs in Exchange 2010 vs 2016Need to remove all Domain.local proxy address from different AD accountNew SSL Certificate for SMTP Not Workingoffice 365 planner email notificationOffice 365: No incoming emails (451 4.4.4 Temporary server error. Please try again later ATTR5)Open rpmsg fileOutbound relay failingOutlook not connecting POP3/IMAP clients SSL/TLSOver 700 messages in Shadow Redundancy queue after migrating to Exchange 2016 from Exchange 2010Performance monitor event - OAuthRequestFailureTriggerPrevent open internal relay on Exchange 2016Prevent Send Email by Powershell command " Send-emailmessage" to Exchange Server in Our DomainProblem with DKIM/DMARC when Exchange forwards e-mailProgram Files\Microsoft Exchange Server\V15\TransportRoles\data\Temp\UnifiedContentQueue not clearing out (Shadow Redundancy)Receive Connector TLS Certificate name errorRecipient address rejected: SPF failRemote Server returned '550 5.7.133 RESOLVER.RST.SenderNotAuthenticatedForGroup; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this group'Remote Server returned '554 5.4.108 SMTPSEND.DNS.MxLoopback; DNS records for the next hop domain are configured in a loop -> DnsDomainIsInvalid: InfoMxLoopback'RevocationCheckFailure error in Exchange Admin Center(EAC)Scan to email with 25MB exceeds size limitsScoped Send Connector: When to use?Send as a Shared Mailbox to a distribution group with a list of allowed senders??Sender denied as sender's email address is on SenderFilterConfig listSending external e-mails from multi-functional printerSetup an auto-reply for an Office 365 distribution groupSingle server configuration. 550 5.7.54 SMTP; Unable to relay recipient in non-accepted domainSmart Host Connector DeliverySMTP Relay to External domainSMTP; Hop count exceeded - possible mail loop detected on message idSomething went wrong and we haven't been able to send your message yetStep by Step Guide to configure coexistence Zimbra -Exchange 2016The server returned status code 550 - Mailbox unavailable. The server response was: Missing RDNS entryThe transport worker process crashes continuously on startup.There's a problem with the recipient's mailbox. Please try resending the message. If the problem continues, please contact your email admin.This is a MIME-formatted message.Transport Rule for a distribution groupUnable to receive mail Message tracking error : [{LED=250 2.1.5 RESOLVER.FWD.Forwarded; recipient forwarded};{MSG=};{FQDN=};{IP=};{LRT=}]Unable to recive email 554 5.4.4 SMTPSEND.DNS.NonExistentDomainUnable to sent the mail Error code: 0xC00402C7.Using S/MIME for a forwarded shared mailboxWarning: could not send message for past 2 hoursWhy are connections from port 25 proxied to the Client Proxy connector?Winsock error code 10060You do not have the permission to send the message on behalf of the specified userYour message couldn't be delivered because you weren't recognized as a valid senderYour message will be sent, but we're not quite ready