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)

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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.

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.

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

Google apps for mac os. 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.

Tip:

1. If you want to change the attachment size to be unlimited, enter 0 into the Maximum Attachment Size textbox.

2. If you want to set the attachment size to default size, enter 1 into the Maximum Attachment Size textbox.

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Your storage space

When you sign up for iCloud, you automatically get 5GB of free storage. You can use that storage for backups, Mail, iCloud Photos, iCloud Drive, and more. If you need more space in iCloud, you can upgrade your iCloud storage.

Limits on sending messages

There are several safeguards in place to make sure that only iCloud members can send messages using iCloud. One of these safeguards includes reasonable limits on:

• The total number of messages you can send each day (1000 messages)
• The number of recipients you can message each day (1000 recipients)
• The maximum number of recipients per message (500 recipients)
• The size of incoming and outgoing messages (20MB, up to 5GB with Mail Drop turned on)

iCloud Mail service is designed primarily for personal use. Sending unsolicited bulk email messages through iCloud email servers is prohibited. To review the iCloud membership agreement and acceptable use policy, please see the iCloud terms and conditions.

When you exceed message sending limits, you might see the following alert messages depending on how you view iCloud Mail:

• On your iPhone, iPad, or iPod touch: A copy has been placed in your Outbox. Sending the message failed because you exceeded your sending limit.
• On your Mac: Cannot send message using the server iCloud.
• On iCloud webmail: Cannot send message. You have exceeded the total number of messages you can send each day (or you have exceeded the total number of receipients you can message each day). Or, Recipient limit exceeded. This message cannot be sent because it has too many recipients.

If you continue to exceed message sending limits, follow these steps:

• Check your Mail Outbox to see if it contains unsent messages. Resend or delete the unsent messages.
• Check for any network monitoring software that might be using your iCloud Mail account to automatically send messages (like firewalls or internet security software that sends alerts about security issues).
• If you send messages to groups, make sure all email addresses in the group are valid (For example, make sure that all email addresses are spelled correctly).