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(Market Share) - June 2015
Mail clients for your mobile device or personal computer:
a winmail.dat file sometimes shows up as an attachment in mail sent via Outlook on Windows computers.
Unfortunately, Outlook does not "play nice" with the other email programs all the time. This causes problems, not for the sender of the email, but the recipient, particularly when actual files are attached to messages.
When an Outlook user composes and sends a message using either Rich Text Format or HTML Format, Outlook automagically generates a file, winmail.dat, and attaches it to the end of the message. winmail.dat contains formatting information, in a human-unreadable form, that Outlook will use on the receiving end to display this email message correctly. Unfortunately, Outlook is the ONLY email client program that can use this information! Netscape Messenger, Eudora*, and other email client programs don't understand this information.
Theoretically winmail.dat could also contain attachments, but myexperience has been that if other attachments (e.g. word documents, pictures) are included, they show up individually not in a winmail.dat file.
How to avoid sending winmail.dat:
If you enter the recipient's address manually in the To: line of your email message, you must choose Format->Plain Text from the menu bar or change the default to plain text in Tools -> Options.
There are several programs that allow you to decode winmail.dat
An email address such as John.Smith@example.com is made up of a local part, an @ symbol, then a domain part.
Dots and capitalization doesn't matter in gmail. email@example.com = HOMERJSIMPSON@gmail.com firstname.lastname@example.org = Homer.J.Simpson@gmail.com Multiple Addresses: Separate by a comma. To: email@example.com, TedSee:
How to Separate Multiple Recipients Correctly - About Email
Receiving someone else's mail - Gmail Help