Working Safely With Email Attachments

Avoiding Computer Viruses Receiving Attachments Downloading Non-Image Attachments Viewing Image Attachments Sending Attachments

Sending Attachments With Outgoing Email Messages

You can send all types of files as attachments, including word processor or spreadsheet documents, audio files, image files (such as .bmp, .jpg, .gif), web pages saves as HTML files, and more. You’re allowed up to 50 files per message with a maximum total message size of 25MB. After you log in to your Mail account, simply compose your message and add your attachment.

Tip: The Composing and Sending Email Messages tutorial introduces the basics about adding attachments to messages you send; click here to see this information.

This tutorial covers the following topics:


With Mail, effective email virus protection is automatic. Anti-virus software in Mail automatically detects and cleans viruses in incoming and outgoing email and attachments.

Please be aware, however, that not all viruses can be detected and cleaned. Downloading email attachments to your computer or sending email attachments to others can be risky. As provided in the Terms of Service, neither Yahoo! nor its licensors are responsible for any damages caused by your decision to do so.

Although Mail often shows attached images and HTML files within the messages you receive, it doesn’t display the files you attach within a message while you’re composing it. Instead, it lists the files in the attachments area. Attached images and HTML may appear within the text of the message when your recipients read it if their email applications support inline graphics and HTML content.


Here’s How

To install the Mail attachment tool:

Install this tool if you want to use many of the attachment management features, such as selecting multiple files at once (including an entire folder), seeing thumbnails of attached pictures, rotating pictures, and sending more photos more quickly. You only need to perform the installation one time per computer—once installed, it’s available to any Mail user on any browser.

  1. Open Mail.

  2. Click the New button.

    Click the New button.

    A New Email Message tab opens.

  3. Examine the attachment bar at the very bottom of the tab. If you see a link labeled Attach, the tool is already installed and you don’t need to do anything else. Click here to learn more about attaching files.

    The Attach link means the tool is already installed.

  4. If you see a link labeled Attach files more easily, click the link to start the installation.

    Click Attach files more easily to start the installation.

    The Share Photos and Files more easily window opens.

  5. Check the box next to I agree with the Terms of Service..., then click Continue to continue the installation.

    Click Continue to continue the installation.

    The installation progress window now opens and remains open, showing the progress of the installation, until the process is complete.

    The installation progress window

    During this time, other windows will appear, prompting you to confirm that you want to run the installer. Just exactly what windows appear and what you need to do to respond depends on your computer’s operating system. Just follow the on-screen instructions.

    When the installation is complete, the progress window closes and the attachment area at the bottom of the New Message tab shows the Attach link. You’re ready to go!

    The Attach link means installation is complete.

    Tip: See the Composing and Sending Email Messages tutorial to learn the basics about adding attachments to messages you send.


To rotate attached images:

  1. Start composing a message; attach one or more image files to it. (Remind me how.)

    The attachments pane displays thumbnails of the attached files.

    One attached image needs to be rotated.

  2. Hold the cursor over an image that needs to be rotated and click the Rotate button (Rotate attachment button).

    Click the Rotate button.

    Each time you click the button, the image rotates clockwise 90 degrees.

    All better!


To change the size of attached image files:

You can choose the size for image files attached to your email messages. Use smaller files (lower quality) for pictures to be viewed just on a computer screen or send larger files (higher quality) if the images are going to be printed.

  1. Start composing a message; attach one or more image files to it. (Remind me how.)

    The attachments pane at the bottom of the message tab shows the number and total size of the attached files. The size of individual images appears below each image.

    The number and total size of attached images.

  2. Click the Photo Size menu at the upper right of the attachment pane. The currently selected image size has a check mark next to it on the submenu.

    The current image size is checked.

  3. To attach larger versions of the images to your message (that is, images that are higher quality for printing), select Don’t Resize from the menu. The new size selection applies to all the images attached to the message.

    Select Don’t Resize from the Photo Size menu.

    The attachment tool reloads the attached images using the new size.

    The attachment tool applies your changes.

    When the reloading is complete, the new total image size appears above the thumbnails.

    The new total image size appears.


To remove attachments before you send the message:

You can easily remove any or all attachments from a message before you send it.

  1. Start composing a message; attach one or more files to it. (Remind me how.)

    The attachments pane displays images of the attached files.

    Attached files appear below the message.

  2. To remove a specific attached file from the message, hover over its thumbnail and click the Remove button (Remove attachment button) to delete it.

    Click the Remove button to detach a file.

  3. To remove all files attached to a message, click the Remove All link above the attachments pane.

    Click the Remove All link.

    The attachments pane is now empty again.

    The attachments pane is emptyEnlarge


What’s Next

After one or more files are attached, you can finish addressing, composing, and sending the message as you normally would.

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Words to Know

  • Attachment: a separate file included as part of an email message; for example, a multimedia or document file.
  • Cleaning: removing a virus or other infection from your computer.
  • Download: to transfer a file from a remote computer to your computer.
  • Scan: the process of checking files to see if they contain known viruses or other types of nuisance software.
  • Thumbnail: a small version of an image, often linked to a larger version.
  • Virus: a computer program that attaches itself to other programs and causes harm to computer software, data, and/or hardware, often undetected until it’s too late.