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Archive for the ‘MailFlow’ Category

Exchange 2016 Mail Flow Deep Dive

Let’s take a look at Mailflow with Exchange 2016. Mail flow changed from the previous versions and consists of transport pipelines.
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Internal Relay mailflow setup in Exchange 2016

Let’s take a look at a scenario where Orgn A (abc.com) acquired Orgn B (123.com) and you are tasked with setting up Orgn A’s exchange server to accept all emails from the internet for both the Org’s
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Unable to send emails to few users on UNIX from exchange server 2013

Recently worked on a case recently where the customer werent able to send emails to few users who are on UNIX. They do not have the mailboxes on Exchange but have them on UNIX
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SMTP Relay connectors in Exchange 2016

As we all know A Receive connector is responsible for all SMTP inbound connections from an external source, client/partner or another Exchange server. (more…)

Test-Mailflow with Exchange 2013

Test-Mailflow is a cmdlet available in Exchange 2013. This command allows us to test the delivery of mails between two mailboxes. The test will be performed using the system mailbox. Test-Mailflow cmdlet basically tests the mail submission, transport, and delivery. This command is used to verify that the system mailbox on one Mailbox server can successfully send a message to the system mailbox on another Mailbox server. By running the command Test-Mailflow, we can find if the mail flow was successful or not. Along with the information we can also see the message latency info, which will be useful in finding out slow mail delivery due to server or network issue.

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Exchange 2013: Blocking 1 CAS from Mail CAS Proxy

Today I wanted to test if I can create a send connect to use CAS and block one CAS server.
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Exchange 2013: 451 4.0.0 DNS query failed

Today I got 2 issues which are interesting so I am sharing the experience.
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Edge Transport: Incoming mails stuck in the queue with error 4.4.1

Today while configuring an Edge transport, I got the below error. I am sharing the resolution to help others.
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Exchange 2010: Message Queued with 451 4.4.0 Dns query failed

We discussed this error earlier here http://msexchangeguru.com/2013/11/23/451-4-4-0-dns-query-failed-the-error-was-smtpsend-dns-nonexistentdomain-nonexistent-domain/
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Mailflow: DNS and rDNS should be same

Another issue came on way so sharing my experience. This time it is related to matching of DNS records. (more…)

Migration: MailFlow and DNS PTR Record Readiness

Recently I have been working on a Migration deployment and Lets have a look on the import points to check during mail routing gateway change. (more…)

Office 365 / EOP: All emails Quarantined

Recently I was working on my EOP environment and our emails started going to the spam quarantine. I could not find fix over the internet so thought of sharing how I fixed it. (more…)

Exchange 2013 SP1: Edge Transport Server Installation and Configuration

Edge Transport Server has protected many Exchange Infrastructures and we liked to rely on Microsoft since the release of Anti-spam in Exchange 2003 SP2. (more…)

Microsoft VTC 2014 Event: March 19 2014

Microsoft Virtual Tech Conference is back and will held on March 19 2014.

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Exchange 2010: Unable to Export Edge Subscription file

Unable to Export Edge Subscription file after DNS Suffix Change of the DMZ Edge Server.
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451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain

This blog post is to address a specific issue with mailflow and DNS query (more…)

Exchange: Mail attachments are turning to winmail.dat

This is a very common issue but I just wanted to highlight the component which supposed to be changed here. (more…)

Exchange 2013: Messages Stuck In Drafts

Recently while helping on technet I identified this issue which is very rarely seen so I thought of sharing it here. (more…)

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