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Changes coming to the SMTP Authenticated Submission client protocol

Exchange Team Blog - Fri, 04/20/2018 - 13:48

There are a number of client protocols offered by Exchange Online to allow email clients to send email from their mailboxes. One of the most widespread protocols is SMTP Authenticated Submission (also known as SMTP Client Submission) which is supported by most email service providers. This non-proprietary protocol is used to send email by legacy email clients, third-party software and services, and devices such as multi-function printers. Changes that we’re making to how this protocol works in Exchange Online may adversely affect the rate at which these clients or devices can send email.

Starting June 1, the following changes will begin rolling out for SMTP Authenticated Submission protocol:

  • Sent email will now be stored in the Sent Items folder of the mailbox.
  • Only three concurrent connections to our service per mailbox will be allowed. Additional connections will be rejected with the error: 4.3.2 STOREDRV.ClientSubmit; sender thread limit exceeded.

Exchange Online uses a number of mechanisms to protect the service from abuse and ensure fair usage by users. One such protection is the Recipient Rate Limit (RRL) which limits the number of recipients per day to 10,000. The aim is to deter the sending of bulk email (and as mentioned on the service limits page, you should send bulk email using a specialized third-party provider). This change to the SMTP Authenticated Submission protocol will further protect the service from large bursts of emails in a short amount of time from automated systems. This will not affect the majority of SMTP Authentication Submission users who only send from one email client or multi-function device for a given mailbox.

For customers who have numerous devices sending emails using the same mailbox (for example, printer@contoso.com), there’s a small chance that multiple devices will try to send email at the same time. Any devices that are rejected would just need to retry. The same is true if an application that uses a cloud mailbox to send email tries to send multiple messages at the same time (and that behavior depends on how the application was designed). Most applications and devices that send email should be able to handle errors and retry sending email. However, retrying will reduce the overall rate at which email can be sent.

If this change adversely affects you, you have a few options:

  1. Use a different mailbox for each application or device.
  2. If you’re trying to send thousands of copies of the same message (for example, a newsletter) in parallel using a third-party application, you may need to send it out in batches or use distribution groups.
  3. If time is important (for example, an alert system that generates multiple alerts at the same time), you’ll need to use a third-party delivery service that’s designed to send large amounts of email.

Sean Stevenson

Citrix Takes Action to Protect Its Innovation

Citrix Blogs - Fri, 04/20/2018 - 09:25
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Small Town, Big Impact: How WAGO Uses Citrix Cloud Technology to Power the Future of Work

Citrix Blogs - Fri, 04/20/2018 - 06:30
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Google and Citrix: Securing Enterprise Workspaces From Chromebooks to Cloud

Citrix Blogs - Thu, 04/19/2018 - 12:00
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The Stroopwafel Effect: CTPs, Community & #CitrixSynergy

Citrix Blogs - Thu, 04/19/2018 - 11:00
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London, Lloyd’s & Umbrellas: How Beazley is Transforming the Future of Work

Citrix Blogs - Thu, 04/19/2018 - 09:00
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Join Citrix and MTM for One FREE Virtual Instructor-led Workshop of Your Choosing!

Citrix Blogs - Thu, 04/19/2018 - 07:00
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Running Google Chrome on Citrix XenApp and XenDesktop

Citrix Blogs - Wed, 04/18/2018 - 11:00
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Health Choice Network (HCN): Improving Lives with Citrix Cloud

Citrix Blogs - Wed, 04/18/2018 - 09:00
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The Importance of 20,000 Miles and Partner Feedback

Citrix Blogs - Wed, 04/18/2018 - 07:00
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The Role of Technology in Shaping South Africa’s Key Economic Sectors

Citrix Blogs - Wed, 04/18/2018 - 01:00
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OffCAT’s replacement – Microsoft Support and Recovery Assistant (SaRA)

Exchange Team Blog - Tue, 04/17/2018 - 17:46

After over five years of providing configuration information and solutions to known issues, the OffCAT team is planning to remove OffCAT from the Microsoft Download Center on May 31, 2018. The good news is that core OffCAT features have been consolidated with the Microsoft Support and Recovery Assistant for Office 365 (SaRA) tool at https://diagnostics.outlook.com/. This will simplify the lineup of troubleshooting tools available for Outlook while at the same time provide the same level of Outlook scanning capabilities as OffCAT. In addition, SaRA also offers several enhancements including the ability to identify and fix specific issues with Outlook, Office Setup, OneDrive for Business, and several other Office programs.

We encourage you to transition very soon to the SaRA tool to scan for issues in Outlook. To help you with your transition, the OffCAT team compiled the following FAQ:

Where can I get information on scanning Outlook with SaRA?

Complete details on scanning Outlook for known issues or configuration information are available in How to scan Outlook by using the Microsoft Support and Recovery Assistant tool.

Do I need an Office 365 account to run SaRA?

To scan Outlook for known issues and to create a detailed report of your Outlook configuration, you do not need an Office 365 account. However, for most of the other scenarios provided in SaRA, you will need an Office 365 account.

Will OffCAT be uninstalled during the SaRA installation?

If already installed, OffCAT will not be automatically uninstalled when you install SaRA. OffCAT and SaRA use two separate installations that are not tied together.

Will OffCAT rules continue to be updated?

We are planning on updating and publishing OffCAT rules to the Internet through August 31, 2018. After this date, OffCAT will continue to function, but your scan results can be out-of-date.

Will I still be able to view existing OffCAT scans?

Yes. As long as you have OffCAT installed, you can view any OffCAT scan.

Which OffCAT features are not found today in SaRA?

The OffCAT team migrated the most frequently used features to SaRA. Here are the features that were not migrated and links to alternative resources (if available).

Note, SaRA does provide scenarios that identify and address issues with the following Office programs:

  • Outlook
  • Office Setup and Activation
  • OneDrive for Business
  • Skype for Business
  • KMS client activation

To troubleshoot KMS activation issues, we recommend these resources:

How do I request features for SaRA?
We hope that SaRA was able to detect and possibly provide a fix for your Outlook issue. Regardless of the outcome, however, you can suggest features when you see the survey at the end of the scenario.

Greg Mansius

Citrix at RSA 2018: Discussing a New Security Framework for the Modern Workspace

Citrix Blogs - Tue, 04/17/2018 - 14:15
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XenMobile Strikes Balance Between Security & Privacy for BYOD with Unique Capabilities

Citrix Blogs - Tue, 04/17/2018 - 13:00
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Mobile Threat Defense Gains Momentum as Additional Security Layer

Citrix Blogs - Tue, 04/17/2018 - 11:00
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Citrix Wins Cloud and Application Security Awards from Cyber Defense Magazine

Citrix Blogs - Tue, 04/17/2018 - 07:00
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See Why Endpoint Management “Now Matters” at RSA

Citrix Blogs - Tue, 04/17/2018 - 05:00
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Expand the Value of Office 365 with ShareFile

Citrix Blogs - Mon, 04/16/2018 - 11:00
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Death, Taxes & the Cloud

Citrix Blogs - Mon, 04/16/2018 - 09:00
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A Decade of Learning, Networking, and Innovation at Citrix Synergy

Citrix Blogs - Mon, 04/16/2018 - 07:00
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