Due to which many users had to face a lot of problems. What is the default maximum message size in Office 365?įor the past few years, the maximum email message sending or receiving limit in Office 365 was 25 MB. If you are an Office 365 user and want to increase your email size limit, then this post will be helpful for you. We will also learn methods to increase mail attachment size in Office 365. In this post, we will discuss Office 365 email size.
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"If you already have your default or custom domain DKIM enabled in Office 365, it will automatically be upgraded from 1024-bit to 2048-bit at your next DKIM configuration rotation date," says Microsoft.Īdministrators can manage DKIM configuration using the Get-DkimSigningConfig cmdlet via Exchange PowerShell Admin sessions.| Email Conversion Top 2 Methods to Increase Emails Size Limit in Office 365Ī lot of users ask questions regarding low mail size limits, such as how to increase Office 365 email size, how to increase Outlook 365 attachment limit, what is Outlook 365 max attachment size, etc. Redmond is also rolling out increased DKIM key sizes to 2048-bit from the current 1024-bit size for all Office 365 customers during October, to enhance security in all environments. Microsoft provides more information on how to properly validate outbound email sent from Office 365 custom domains using DKIM and on how to prevent spoofing by configuring SPF in Office 365. The suspicious email indicator is going to be automatically tagged with a question mark if the message did not "pass either SPF or DKIM authentication and receive either a DMARC pass, or a composite authentication pass from Office 365 Spoof Intelligence." Microsoft also states that emails will not be analyzed using the Unverified Sender filter if the user has set the sender as a 'Safe Sender' in their inbox or the messages were delivered to the user's Outlook inbox via an admin allow list, including Email Transport Rules (ETRs), Safe Domain List (Anti-Spam Policy), or Safe Sender List. When one of the emails in your inbox gets marked by the Office 365 Unverified Sender feature, you should be careful while interacting with them as they could be malicious or being sent by a potential attacker that spoofed the sender. This will make it easier for Office 365 users to quickly detect potential phishing attacks or potential sender spoofing attempts says Microsoft. If Unverified Sender is toggled on, all emails that come from unverified sender will have the sender's photo or initials replaced with a question mark in the people card as shown above.
The new indicators will be shown in the user's Outlook inbox for messages where the client couldn't verify the sender's identity using email authentication techniques. "In order to help customers identify suspicious messages in their inbox, we've added an indicator that demonstrates Office 365 spoof intelligence was unable to verify the sender." "Unverified sender is a new Office 365 feature that helps end-users identify suspicious messages in their inbox," says the company on the new feature's Microsoft 365 roadmap entry. Microsoft is currently rolling out a new Office 365 feature dubbed 'Unverified Sender' and designed to help users identify potential spam or phishing emails that reach their Outlook client's inbox.