Outlook Attachment Extension

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Sergei Chime

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Aug 4, 2024, 5:50:02 PM8/4/24

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Oneof the most common ways of transmitting computer viruses is through file attachments. To help protect you and your recipients against computer viruses, Outlook blocks the sending and receiving of certain types of files (such as .exe and certain database files) as attachments. If you need to send one of these file types to an email recipient, we recommend using OneDrive and sending the recipient a link to the file instead.

There are several ways to send and receive a blocked file. You can save the file to the cloud and send a link to the file, use a file compression utility like WinZip, or even rename the file with another extension, then have your recipient change the name back to the original name after they receive the file.

Save the file to the cloud

If you need to send a file that's blocked by Outlook, the simplest way to send your file is to upload it to OneDrive or a secure network share server such as SharePoint. Then send a link to the file. If you need to receive a blocked file, ask the sender to upload the file to OneDrive or SharePoint and send you a link. Once you receive the link, you can open the file location and download the file.

Rename the file

You can rename the file (or request that the sender rename the file) to use an extension that Outlook doesn't block. For example, you can rename file.exe to file.docx. Once the renamed file is sent (or received), save it and rename it with the original extension using the following steps.

If you use a Microsoft Exchange Server account and the Exchange Server administrator has configured your Outlook security settings, your administrator might be able to help you. Ask the administrator to adjust the security settings on your mailbox to accept attachments that Outlook blocked.

i am able to iterate through email attachments in azure logic app. i must have to compare attachment extension before further processing. i have been trying with content type parameter and passing values like '.xml' or 'xml' or 'application/xml'. none of them worked well.

This article describes how to configure Microsoft Outlook to block attachment file name extensions that Outlook does not block by default. If you use Outlook in a Microsoft Exchange environment, you can configure the server to block certain attachment file name extensions by using the Outlook E-mail Security Administrator Package.

If you have an Exchange environment that uses the Outlook Security Administrator Package and you want to add more attachment file name extensions that you want to block in your Outlook configuration, you can add more attachment file name extensions to the Level 1 file list. To do this, follow these steps:

If you want to add more attachment file name extensions in the Add box, you can separate them with a semicolon. For example, if you want to block both the .zip and the .gif attachment file name extensions, type .zip; .gif

If you the Show Level 1 File Attachments check box from step 4 was already selected to allow all Level 1 attachment file name extensions types to appear in the e-mail message as an attachment, you must add the attachment file name extensions that you do not want to appear in the e-mail message as an attachment by following this one additional step:

This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, see How to back up and restore the registry in Windows.

If you are using Outlook 2002, Microsoft Office XP Service Pack 1 (SP1) or later must be installed on your computer so that you can configure Outlook 2002 to block certain attachment file name extensions.

file_name_extensions is a list of the attachment file name extensions. Each attachment file name extension is separated by a semicolon. For example, type .zip; .gif if you want to block both .zip and .gif files from appearing in the e-mail message as an attachment.

Sometimes you may not be clear about attachments' names, content, etc. but attachments' file types (file extension) in messages. For example, the only thing you remember is that the attachment is a Microsoft Word document with meeting time. How to find out these attachments of specified file types? It seems hard to find out attachments of special file types with existing search tools in Microsoft Outlook.

For example, if you want to find out the messages that contain attachments of zip files, please input the ext: zip in the search box. Then it will filter the messages with attachments of zip in one minute.

Take the attachments of zip files and of txt files for example, just enter the ext: (zip txt) in the search box, and then it will find out the messages which contains both attachments of zip files and attachments of txt files at the same time.

For example, you need to find out the messages with attachments of word documents (docx), but exclude messages with attachments of workbook (xlsx). In other words, the messages with both attachments of docx and attachments xlsx don't meeting your needs. In this case, just enter the ext: (docx NOT xlsx) in the search box.

When sending attachments via Outlook email I've just started seeing the first pdf file attachment changing to a PD file extension (blue), whilst the others stay the same, a pdf . The recipient can't view the file when opening it to view, as its a PD extension, however when they save the file then open it works fine, and similarly on my PC. If I delete the first file, the pd, the rest stay as pdf files, as they were originally.

I ended up here because a co-worker was exporting PDFs from InDesign files and one file in particular was creating a "PD" file as well as a 0k PDF (that Windows 11 recognized as a security threat.) We triple checked her PDF export settings and did all the normal dignostics and it kept happening just to one file being saved in one particular folder. In frustration she opted to save the PDF to another location and all was fine. Deleted the original destination folder and re-created it as new, p

Our belief from this, and from what you shared, is that this has to be an issue somehow buried within the Windows file system itself, as it was very specific to that location (does not appear to be a "path" or "naming" issue as the other folders have similar paths and utilize same naming conventions -- which makes me think this falls under "Windows Glitch" territory because we could not recreate it.)

Hey @AKalkantova this would actually be down to your outlook configuration then. HubSpot doesn't sent or intercept the emails sent from your email client, it simply sends a copy of it (via bcc) to it's servers to log. So if you're sending the email from outlook at the attachment isn't going through to the recipient, this would actually be down to outlook. I'd advise reaching out to your IT or mail server admin to find out what may be blocking this.

Hi, I'm from a different company with the same issue. On our side, the setting is enabled. the attachment will be completely removed from the email resulting in lots of emails sent without an attachment.

Hi, the attachment is not sent at all with the email. We send the email from our client - Outlook. We found that this occurs in the Outlook app (not in the browser online version). Happens to multiple members.

The same thing is happening to me! I see the paperclip showing I have attached a file when the email is sending out, and once the email successfully sends, the paperclip attachment icon is gone, and so is the attachment.