EOP Field Notes

Exchange Online Protection: Notes from the field

EOP Field Notes

  • In case you missed it - April 2015 edition

    There was a lot of Exchange Online / EOP and Office 365 news in April and I wanted to pull them all together in one place, here! The stories range from product updates all the way to announcing new services. I have placed the articles that directly relate to Exchange Online towards the top of the list.

  • Need details on who and what are triggering your rules? There's a cmdlet for that!

    Need to get a list of all messages that triggered a particular transport rule, or do you want to see all rules that have been triggered by a particular sender? This information can be easily found using the Get-MailDetailTransportRuleReport cmdlet. Looking past the name being much too long, this cmdlet can provide very insightful information about your transport rules.

    What better way to show off this cmdlet than with examples. Here we go.

  • Advanced Threat Protection

    In case you missed it, we have something new coming to Exchange Online. Last week on Office Mechanics, Shobhit Sahay, technical product manager for the Office 365 team, introduced a new service coming to Exchange Online Protection (EOP), Advanced Threat Protection.

    Advance Threat Protection (ATP) adds another layer of security and protection on top of EOP, targeting specific types of advanced threats.

  • Use PowerShell to search for transport rules (updated)

    Update (April 7, 2015): More content and examples have been added to this article since the original posting.

    PowerShell can be used to quickly search for rules matching specific criteria. This can be incredibly valuable for a tenant that contains a lot of rules. While possible to search for transport rules in the EOP portal, PowerShell offers a more comprehensive (and cooler) way to accomplish this. There are also some rule properties that can only be searched for with PowerShell.

  • MS-DOS Mobile has arrived

    I typically avoid the Internet like the plague on April fools day, but this morning I peaked and came across MS-DOS Mobile and just couldn't help but share. This April fools day app brings DOS directly to your Windows phone! Let's take a trip down memory lane and see what we can do with this app.

  • EOP IP Address Additions - March 2015 Edition

    This is a quick public service announcement before the weekend starts. Exchange Online Protection has been allocated a new IP range. Starting in 30 days, EOP will add 40.107.0.0/16 to the IP pool that is used to deliver mail that passes through custom connectors (ex. EOP outbound connector which routes inbound mail to your on-premises environment). 

  • Troubleshoot a broken junk mail folder

    I recently worked on a very interesting case that I wanted to share. This organization had set EOP to deliver all spam messages to end users junk mail folder.

    This worked great for most users, but a small number experienced EOP delivering spam messages directly to their inbox, as if they weren’t being scanned at all. Very peculiar indeed. Let’s go through the troubleshooting process to figure out what’s happening here. 

  • Determine where a message leaves an Office 365 tenant

    When troubleshooting mail flow it is often important to determine where a message is handed off from a partner to your Office 365 tenant, or from your Office 365 tenant to a partner. This is easy to see in a message header, just look for the receiving host with the domain mail.protection.outlook.com, as this will indicate Office 365 servers.

    But what if your partner is also an Office 365 tenant, then how can we tell when a message left their tenant and entered yours, or vice versa? If troubleshooting a mail delay, this is crucial information as this will let us know which tenant is experiencing the delay.

  • Using DMARC to Prevent Spoofing

    I have recently seen a large number of cases where an organization’s own domain was spoofed to send that company phishing messages. This isn’t all that uncommon, but what was concerning for me was the method used in these cases to do the spoofing. In these cases, only the 5322.From header was spoofed, which cannot be detected by an SPF check.

  • Ensure your SPF Record is Correct

    I've recently seen an increase in cases that involve incorrectly published SPF records that have resulted in sent mail failing the SPF check. Ensuring your SPF record is up to date is great proactive work that can help prevent issues with SPF checks. In this article I'm going to go over how to properly set your SPF record if you are using Exchange Online or Exchange Online Protection.

    There is also a common mistake that organizations sometimes make in their SPF record when they are smart hosting mail out through EOP which I will also highlight.

  • Recipient Notifications

    The ability to send a notification to the recipient when a transport rule triggers. This is a request that we have received from a lot of customers, and I’m happy to let you know that it is now rolling out in the form of an action in EOP transport...
  • IP Ranges Added to EOP

    On TechNet we publish the range of IP addresses that are used when sending mail out of a custom EOP connector. If you have created an EOP on-premises connector to deliver inbound mail to your on-premises mail environment, or an EOP partner connector to...
  • An Ode to EOP

    This is typically a slow week for people, so what better time than to post something fun about Exchange Online Protection! Back in May I presented a session on EOP at TechEd North America 2014 which took place in Houston. To be a little different,...
  • Top Ten Posts of 2014

    I only began this blog in June of this year and so it’s hard to believe that it is already six months old! Looking back over the past six months I have had a blast writing and sharing articles with the community and have received a lot of positive...
  • Message Trace, the PowerShell Way

    From my experience, a very small number of people actually choose PowerShell over the GUI (Graphical User Interface, ie. The Office 365 Portal). But once you get a grasp of PowerShell and write some scripts, you’ll see the light and going back to...
  • Exchange Server December Updates

    Update, Dec 11/14: Exchange Server 2010 SP3 Update Rollup 8 has been temporarily pulled due to a problem. Update, Dec 15/14: Exchange Server 2010 SP3 Update Rollup 8 v2 has been posted While I mainly target Exchange Online Protection with this blog...
  • Remote Desktop Connection Manager updated to v2.7

    Remote Desktop Connection Manager, or RDC Man, is a wonderful piece of software that I’ve been using for the past eight years. RDC Man is one of those applications, like Outlook, that I open almost every single day and although not directly applicable...
  • An Early Gift, EOP Bulk Mail Detection - The Easy Way

    This past summer we added new bulk detection capabilities to Exchange Online Protection. At the time, if you wanted to take advantage of these new capabilities you had to add an EOP transport rule to detect the BCL (bulk complain level) that EOP stamped...
  • Easily tell which transport rules a message triggered

    Hello fellow traveller, come sit with me by the fire, there is plenty of room. You look to be weak from your travels, I have plenty of rations that I will gladly share with you. I have many stories from my own travels that I would love to share. Wait…...
  • Transport Rule Limit Increase

    In the past the maximum number of transport rules that you could create in Exchange Online ( Enterprise , Education , and Government plans) was 100. This limit has recently been increased to 300 (for Enterprise , Education , and Government plans)! For...
  • Best Practices for Finding Executable Content

    This article may be common knowledge for some, but it is important to revisit and refresh outselves on. You may be aware of what content EOP will flag as being executable, or you may not. In either case, I think this is an important topic so sit back...
  • P2 Headers Now Respected for End User Safe and Blocked Senders Lists

    Exchange Online Protection will now evaluate both the P1 and P2 headers in a message against an end users safe and blocked senders list. I know, I’m super excited too! Previously only the P1 header of a message was compared to these lists. Not only...
  • Daisy Chaining with EOP

    Update Dec 23, 2014 – I’ve revised this article to make a couple of points clearer. On the mail flow side there are no issues with daisy chaining. However, if the intent is to evaluate the effectiveness of EOP filtering, having a service sit...
  • Inbound Connector Configuration You’ll Want to Avoid

    I recently worked with a customer who had a configuration in their EOP outbound connector that broke inbound mail for a newly added domain. I want to share this tale in hopes that you not only learn more about EOP partner connectors, but that you decrease...
  • Behavior Change When Setting the SCL with a Transport Rule

    With my coffee currently in one hand, it would be very useful if I could type with only my other hand. Alas I cannot, so I’ll be typing this article with both hands while my coffee waits for me. With none of this at all being relevant to this blog...