Outlook Web Access (OWA). OWA is a Common Access Card (CAC)-enabled, web-based email client with the look and feel of the Outlook client. OWA allows users access to their mailboxes and calendars. The download version of OWA GAL Search for Mac is 1.3. The package you are about to download is authentic and was not repacked or modified in any way by us. The download was scanned for viruses by our system.
-->Problem
When Office 365 users try to open or view attachments in email messages in Outlook Web App, they experience the following symptoms:
- In Office 365, the attachment isn't displayed in the message. Instead, a generic placeholder, such as '1 Attachment' is displayed, and this can't be opened.
- When users try to view attachments in Office 365, they receive the following error message: Access to attachments has been blocked. Blocked attachments: <FileName>.
Cause
This issue occurs if the attachment is blocked by Outlook Web App. By default, Outlook Web App blocks attachments that have the following file name extensions:
vsmacros, msh2xml, msh1xml, ps2xml, ps1xml, mshxml, gadget, mhtml, psc2, psc1, msh2,msh1, aspx, xml, wsh, wsf, wsc, vsw, vst, vss, vbs, vbe, url, tmp, shs, shb, sct,scr, scf, reg, pst, ps2, ps1, prg, prf, plg, pif, pcd, ops, mst, msp, msi, msh,msc, mht, mdz, mdw, mdt, mde, mdb, mda, maw, mav, mau, mat, mas, mar, maq, mam,mag, maf, mad, lnk, ksh, jse, its, isp, ins, inf, htc, hta, hlp, fxp, exe, der,csh, crt, cpl, com, cmd, chm, cer, bat, bas, asx, asp, app, adp, ade, ws, vb, js
Solution
Change the Outlook Web App mailbox policy to include and exclude the file types that you want.
The following is an example of the Windows PowerShell commands to remove the .xml file type from the BlockedFileTypes and BlockedMimeTypes lists and add it to the AllowedFileTypes and AllowedMimeTypes lists:
Things to consider:d
- It may take several minutes before changes to the Outlook Web App policy take effect.
- Be aware that by changing the Outlook Web App mailbox policy to include file types that are blocked by default, you may make your system more vulnerable to security threats.
Workaround
Direct users to compress the files that they intend to send (for example, as a .zip file) and then send the compressed files as attachments.
More information
Still need help? Go to Microsoft Community.
Mail User Guide
There are various ways to work with attachments in email messages you receive.
View email attachments
- In the Mail app on your Mac, select a message that includes attachments.Look for the Attachment icon next to the sender’s name in the message list.
- In the message, do one of the following:
- Open an attachment in an app: Double-click the attachment.
- Preview an attachment without opening it: Select the attachment, then press the Space bar, or force click the attachment.
Some attachments—like images or one-page PDF documents—are displayed directly in the message. If you’d rather view the attachment as an icon, Control-click it, then choose View as Icon from the shortcut menu. To display the attachment again, Control-click it, then choose View in Place.
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Save email attachments
- In the Mail app on your Mac, move the pointer over the header of a message.
- Click the Attach button that appears, click the name of an attachment or choose Save All, then choose a location.You can also select a message, then choose File > Save Attachments. Or drag an attachment from the message to the desktop to save it there.
Email attachments are saved in the Downloads folder, available in the Dock. To specify a different location, choose Mail > Preferences, click General, then select a folder.
Delete email attachments
- In the Mail app on your Mac, select a message that includes one or more attachments.
- Choose Message > Remove Attachments.The message remains in the mailbox and is annotated to indicate that all attachments were manually removed. For IMAP accounts, attachments are also deleted from the mail server and can’t be retrieved.
When you delete a message that includes an attachment, the attachment is deleted too. To change this setting, choose Mail > Preferences, click General, click the “Remove unedited downloads” pop-up menu, then choose an option. Mail doesn’t delete attachments that you have saved.
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Mail automatically downloads attachments you receive based on the download option you set in Account Information preferences in Mail.
If you send or forward images or PDF documents you receive to other people, you can mark up the attachments with comments, drawings, or a signature before you send them.
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See alsoAdd attachments to emails in Mail on MacDelete emails in Mail on Mac