Computer viruses have been travelling by email for decades, and they are more dangerous now than ever. Today’s malware is designed to stay hidden, steal data quietly and spread from one mailbox to the next. Here’s how it works and how your business can stop it.
How malware arrives by email
Infected attachments. The classic route. A file disguised as an invoice, CV, shipping notice or voicemail contains malicious code. Common carriers include Office documents with macros, PDFs, compressed ZIP or RAR files, and disguised executables.
Malicious links. Instead of attaching a file, attackers link to a website that downloads malware automatically or asks the user to install an “update”.
Fake login pages. Some links don’t install anything; they collect passwords that are later used to access the mailbox and spread more malware.
Compromised contacts. Once one mailbox is infected, malware can send copies of itself to everyone in the address book. Because the email comes from a known contact, recipients are far more likely to trust it.
What malware does once inside
- Steals passwords, banking details and confidential files.
- Records keystrokes to capture everything a user types.
- Gives attackers remote control of the computer.
- Turns the machine into part of a botnet sending spam.
- Opens the door for ransomware to encrypt company data.
Warning signs of an infected email
- Unexpected attachments, even from people you know.
- Requests to “enable content” or “enable macros” in a document.
- Files with double extensions, such as invoice.pdf.exe.
- Password-protected ZIP files with the password in the email body, a trick used to dodge scanners.
- Urgent language pushing you to open the file immediately.
Why desktop antivirus isn’t enough
Antivirus on each computer helps, but it relies on every device being updated and every user behaving carefully. Phones and personal laptops may have no protection at all. The safest approach is to stop malware before it ever reaches the inbox.
Server-side virus protection
With hosted email, every incoming and outgoing message passes through the provider’s servers. That’s the perfect place to scan:
1. Attachments are checked against constantly updated virus signatures.
2. Suspicious file types can be blocked or quarantined automatically.
3. Links are analysed for known malicious destinations.
4. Outgoing mail is scanned so an infected device can’t spread malware to your clients.
Because scanning happens centrally, every user is protected on every device, whether they read mail on a desktop, in a browser or on the mobile app.
Good habits for staff
Technology does the heavy lifting, but people still matter. Encourage employees to verify unexpected attachments by phone, never enable macros on documents from outside the company, and report suspicious messages to IT straight away.
How Smardove keeps viruses out
Smardove scans mail on the server for viruses and malicious content before it is delivered. Combined with its AI-driven antispam engine powered by SpamFoo, two-factor authentication and country-based login restrictions, it stops most threats long before anyone has the chance to click.
| Keep malware out of your inbox. Contact Smardove to learn how our hosted email protects every message, on every device. |
