This site utilizes JavaScript to function correctly. Looks like it's disabled on your browser. Please enable it for your best experience.

For instructions on enabling JavaScript, click here

Skip to main content

Just Host Web Hosting Help

Email Attachments - Blocked File Extensions

Here is a list of file extensions which are not allowed to be sent to any email address on the server. If someone attempts to send an email to a Just Host account with an attachment that has one of these extensions, the email will be returned to the sender and they will be notified that the attachment cannot be sent.

The reason behind this is because files with these extensions can be used to run a program that will install viruses or seriously damage your computer. Spammers and hackers often send emails with these attachments trying to get users to open the attachment. Once it is opened, the computer is infected.

File extensions:

  • bat
  • chm
  • cmd
  • com
  • cpl
  • crt
  • exe
  • hlp
  • hta
  • inf
  • ins
  • isp
  • jse?
  • lnk
  • mdb
  • ms[cipt]
  • pcd
  • pif
  • reg
  • scr
  • sct
  • shs
  • vb[se]
  • ws[fhc])


Knowledgebase Article 95,496 views bookmark tags: attachment block blocked email malware trojan virus


Was this resource helpful?

Did this resolve your issue?


Please add any other comments or suggestions about this content:





Recommended Help Content

Can I send an email with large files/attachments?
Knowledgebase Article 213,764 views tags: email limits

Trying to send out emails from multiple email accounts fail from both webmail and third party email clients. Possible Reasons: The maximum emails per hour has been exceeded. This can be caused by forw
Knowledgebase Article 409,313 views tags: email exceeded mailbox outlook quota receive receiving send sender unable

How to remove the "This site may harm your computer" warning in Google search results.
Knowledgebase Article 250,527 views tags: block blocking google malware

Related Help Content

If you suspect malicious content, hacks or a virus on your VPS/Dedicated account here are some tools located in your WHM that you can use.
Knowledgebase Article 42,336 views tags: clamav dedi dedicated malware virus vps

This article will explain how to create MIME types.
Knowledgebase Article 44,703 views tags: create custom extensions files mime types

This article will explain how to run php and other file types using Cron jobs.
Knowledgebase Article 400,048 views tags: cron file jobs php

I get the following database connection error: Warning: mysql_connect() [function.mysql-connect]: Host 'host#.Justhost.com' is blocked because of many connection errors; unblock with 'mysqlad
Knowledgebase Article 157,519 views tags: blocked connection host localhost mysql

Can't receive emails? Here are a few things to try.
Knowledgebase Article 68,522 views tags: email troubleshooting

. Click the RoundCube logo. This takes you to the main interface screen for RoundCube where your Inbox will be displayed. On the left are your email folders, by default, RoundCube will always show you
Getting Started Article 218,395 views tags: email message reply roundcube send

This article outlines what to do if you find your local IP address has been blacklisted.
Knowledgebase Article 56,468 views tags: access addresses anti blacklist blacklisted blocked denied ip local malware

How can I change the outgoing SMTP port from 25 to 26?
Knowledgebase Article 412,674 views tags: email outgoing port send sending smtp

** Google ad credits are only available to customers in the United States, Canada, and the United Kingdom at this time.

¹ VAT (Value Added Tax) is not included in our advertised price and will be charged separately and itemized on invoices and billing information. Standard VAT rates based on EU Member State regulations may apply. Learn more.