It’s actually pretty common for hosting and email providers to block certain attachment types that bad actors often use to carry out malicious tricks on recipients. One of these is the .eml format —that’s the file type email apps use to save whole message files.
Even our shared cPanel hosting and our budget DirectAdmin plans at LineaHosting come with this restriction by default, all in the name of your security. In fact, every cPanel-based hosting service we offer has it switched on out of the box.
Why? Well, .eml files can hide malicious code that might auto-run when you open them in your mail app, or they can be used to craft super-convincing phishing attacks. To keep your devices and network safe, it’s better to leave them disabled.
Solution:
To get around this, you’ve got two easy options:
-
Forward the email’s text instead of attaching the
.emlfile.
Just hit “Forward” and let your mail app paste the original message into the body of your new email. -
Zip up the
.emlfile before you send it.
Put the.emlinto a.zipor.rararchive and attach that instead.
Most email clients—including Microsoft’s (Office, Windows Mail, Outlook, etc.)—let you choose whether forwarding happens as a file attachment or as inline text. Picking the inline-text option is your best bet: no attachment = no disallowed-extension error.
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