Nov 03, 2017 A client is using Outlook for Mac version 15. There is an existing POP account, and I have created an IMAP account with the intent of moving the mail data to the server and removing the POP account. Most of the data has moved to the server, and these messages have begun popping up: 'The total attachment size exceeds the limit. In this video, you can learn how to Increase the Outlook Attachment Size Limit. In this video, you can learn how to Increase the Outlook Attachment Size Limit. I can receive emails with attachments of any size; with an older computer with Outlook I can send attachments of any size using the same email-account; and the Apple 'Mail' program can send attachments of any size. I am using: Office 365 for Mac, Macbook Pro, El Capitan, Outlook 2016; email-account is POP3, T-Online. Look at Attachments Outlook limits the size of files you can send to 20 megabytes for internet accounts, such as Gmail or Hotmail, and 10 MB for Exchange accounts. If you receive an error message about the file size when you attempt to send an email, increase the size limit for Outlook.

Have you ever faced a scenario where you are sending an attachment in Outlook, and you get an error notification saying that your attachment is too big in size to process? If yes, then this blog is going to help you with this. We are going to discuss how you can send a large-sized attachment with Outlook without getting an error.

First, you need to know that it is a size issue. So, if you have attached something too large, you get an error notification saying, “Attachment size exceeds the allowable limit.” This problem arises not only when you have added a single large attachment, but also when you have added many attachments with a total size of more than 20 MB (20480 KB). 20 MB is the size limit of a message for webmail email accounts. You will be happy to know that even though the size limit for web mail email accounts is 20 MB, the server allows up to 25 MB. So, when we know that the server allows up to 25 MB, this means that there is something we can do to increase the size of the attachment in this case. Let’s learn how the limit for attachment size can be increased.

Step 1- Start with pressing Win + R keys.
Step 2- Type regedit in the box there and click on Ok.
Step 3- Now follow the below-mentioned steps to navigate as per your Outlook versions:

“HKEY_CURRENT_USER¬Software¬Microsoft¬Office¬14.0¬Outlook¬Preferences” for Outlook 2010
“HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookPreferences” For Outlook 2013
“HKEY_CURRENT_USERSoftwareMicrosoftOffice16.0OutlookPreferences” for Outlook 2016 (REFER THE SCREENSHOT)

Step 4- In the Registry Editor Window look for the list that opens after navigating. There you will find an option in the list “MaximumAttachmentSize” double click on that.

Note: If you do not find MaximumAttachmentSize in the list, then right-click on the empty space in the Registry Editor, click on New and then click on DWORD (32-bit) Value. (See the image below)

Step 5- A new dialogue box will open, where you can enter the desired attachment size in KBs. So, here we are doing it 25 MB, this is how much server allows. Enter 25000 in Value Data section. Click on Ok to proceed.

Step 6- Close the Registry Editor and try to send the email with attachment again.

What is the Maximum size for your Email Provider?

Well, knowing the correct limit for the attachment size of your email provider will surely make your job easier. Gmail provides 25 MB limit for attachment size, Google Apps has 20 MB, Yahoo Mail has 25 MB, and AOL Mail has 25.

What else do you require to tackle all issues with your Attachments?

We all know that how important attachments are of while communicating through emails and any issue arising with them is the utmost priority to work on. We are not always capable of dealing with the technical glitches keep on arising every now and then, specially delay in opening Outlook attachments. In this case, it is better to go for a third-party tool which can ultimately solve all your attachment issues. Kernel for Attachment Management is a tool designed keeping in mind every minute details about the attachments and problems that may occur to them. This tool can recover email attachments in no time and can efficiently compress large PST files to save the space. The tool has many exciting features and can run multiple customization rules to extract.

More Information

How to change the attachment size limitation in Outlook?

Sometimes, I can’t insert a big attachment successfully in Outlook, but get a warning dialog box saying the attachment size exceeds the allowable limit. See following screen shots. This error happens due to exceeding the size limitation of attachments in Outlook. In this article, I will guide you to change the attachment size limitation in Microsoft Outlook.

Change attachment limited size with Registry Editor (6 steps)

To change the attachment size limitation in Microsoft Outlook, you have to modify the parameter of MaximumAttachmentSize in the Registry Editor. And you can do it with following steps.

Step 1: Press the Win + R to open the Run dialog box, enter the regedit in the Open box, and click the OK button.

Step 2: In the coming User Account Control dialog box, click the Yes button.

Step 3: Now the Registry Editor window opens. Open the Preferences folder with following paths:

Outlook 2016:HKEY_CURRENT_USERSoftwareMicrosoftOffice16.0OutlookPreferences
Outlook 2013:HKEY_CURRENT_USERSoftwareMicrosoftOffice15.0OutlookPreferences
Outlook 2010: HKEY_CURRENT_USERSoftwareMicrosoftOffice14.0OutlookPreferences
Outlook 2007: HKEY_CURRENT_USERSoftwareMicrosoftOffice12.0OutlookPreferences

Step 4: Click the Edit > New > DWORD (32-bit) Value, and name the new DWORD as MaximumAttachmentSize.

Step 5: Double click the new DWORD to open the Edit DWORD (32-bit) Value dialog box, check the Decimal option, enter the attachment size limitation in the Value data box, and click the OK button. See screen shot below:

For example, you want to change the attachment size limitation to 100MB, enter the 102400 in the Value data box.

Mod left 4 dead 2. Note: If you do not want to limit the attachment size in Outlook, just enter the 0 in the Value data box.

Step 6: Close the Registry Editor window, and restart Microsoft Outlook.

After changing the attachment size limitation in the Registry Editor window, attachments will be inserted successfully only if their sizes are less than attachment size limitation. See following screen shot:

Change attachemnt limited size with Kutools for Outlook

With above method to increase attachment size is a little complex, but if you have Kutools for Outlook -- a handy Outlook addin, you can change the attachment limited size as you need as quickly.

Kutools for Outlook,Includes 100 powerful features and tools for Microsoft Outlook 2016, 2013, 2010 and Office 365.

Free install Kutools for Outlook, and then do as below steps:

1.Enable Outlook and click Kutools > Options. See screenshot:

2. In the Options dialog, click Other tab, and enter the limited size you want to change to into the textbox besides Maximum Attachment Size section. For instance, here I change the attachment size to 10MB (10240KB). See screenshot:

3. Click OK, and a dialog pops out to remind you restart the Outlook programs for taking effect the change. See screenshot:

After Outlook restart, the attachments limited size has been changed.

Outlook For Mac 2016 Attachment Size Limit