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E-Mail Spooling Service - What is a WINMAIL.DAT file


What is a WINMAIL.DAT file?


It's a Microsoft Exchange "feature". Since Exchange supports rich-text email (bold, italic, multiple fonts, etc.), and Internet email doesn't, any email sent from Exchange to a non-Exchange mail reader will contain an Attachment called WINMAIL.DAT. If you use Exchange, you won't see this file, and the message will retain its formatting. However, it can be confusing for those who don't use Exchange and have no use for this file.

To correct this issue on the sending PC:

In Microsoft Outlook, On the Tools menu, click Options, and then click the Mail Format (or "Send") tab. Under the Send tab is the message format list, select Plain Text or HTML(NOT Rich Text Format), and then click OK.

That is all there is to it!

We Answer Your Questions: FAQ

Q: What is the maximum e-mail attachment size?

A: The e-mail servers do not limit the size of individual e-mail attachments. The e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "over-sized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:

1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.

2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.