Select the product you need help with
- Internet Explorer
- Windows Phone
- More products
You receive an "An error of type -3155" error message when you try to send or receive an e-mail message in Entourage for Mac
Article ID: 883725 - View products that this article applies to.
When you try to send e-mail messages or to receive e-mail messages through Microsoft Entourage for Mac, you receive one of the following error messages:
There are two main reasons for this set of symptoms to occur.
Cause 1This problem may occur if your Internet service provider (ISP) has a maximum size limit for attachments, and the e-mail messages that you send or receive include attachments that are more than that limit. Typically, this problem occurs when programs or graphics are attached to your e-mail messages.
Cause 2This problem may occur if the maximum transmission unit (MTU) size setting on the user's Macintosh computer is set to a low value. The MTU is sometimes increased to yield increased performance in DSL and cable modem environments.
Workaround for Cause 1
Sending messages that have large attachmentsUse any one of the following techniques when you send e-mail messages that have large attachments:
Receiving messages that have large attachmentsWhen you receive large e-mail messages that have large attachments, contact your ISP. Your ISP can help you remove these messages from your Inbox on your e-mail server. Additionally, contact e-mail senders, and then recommend that they use one or more of the techniques that are listed in the "Sending large messages" section.
Workaround for Cause 2The most frequently recommended size setting for the MTU is 1492. To reset the MTU size to 1492, follow these steps: