44 Best Email Spam Filtering Services in 2025
Reviews, comparison, screenshots and more for the 44 best email spam filtering services.
Email Spam Filtering Service Comparison
| Email Service | Pricing | Storage | Attachments | Open-Source | Sandboxed Encryption | Unlimited Domains | Unlimited Aliases | TTI | SMTP | IMAP | POP3 | API | E2EE | OpenPGP | WKD |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Forward Email⭐ SuggestedEmail for everyone | $3/mo | 10 GB pooled | 50 MB | Yes | Yes | Yes | Yes | TTI | Yes | Yes | Yes | Yes | ⚠️ Opt-in | Yes | Yes |
Spam ScannerSpam Scanner is the best anti-spam, email filtering, and phishing prevention service | Free (built-in to Forward Email) | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
EgressStop more advanced phishing attacks | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
MailinblackYour cybersecurity is our job | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
AltospamAntispam, Antivirus & Anti-Phishing Software | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
HeimdalOne Platform. Total Security. | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Check Point AvananPrevent Phishing before the Inbox with Email Security from Check Point | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
TrustifiProtect Your Business Emails with AI-Powered Security | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
LibraesvaEmail Security, Email Archiving, Phishing Awareness, DMARC | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
OOPSpamAutomate your Spam and Abuse Detection | $49/mo | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
DuoCircleProtect Email Against Phishing, Spam and Malware | Requires you to talk to a sales team | Requires 3rd party | 50 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
N‑able Mail AssureEmail protection to help you secure and scale | Requires you to talk to a sales team | Requires 3rd party | Depends on inbound/outbound (e.g. 10 MB) | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Vade SecureSimple, Sophisticated Email Security Powered by AI | Requires you to talk to a sales team | Requires 3rd party | 50 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Spam HeroCloud-Based Spam Filtering | $8/mo | Requires 3rd party | 50 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Abnormal SecurityCloud Email Security - Block Malicious Email Attacks | Requires you to talk to a sales team | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
DarktraceCyber security that learns you | Requires you to talk to a sales team (according to Amazon AWS Marketplace it may cost upwards of $30,000/mo) | Requires 3rd party | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
FortinetGlobal Leader of Cybersecurity Solutions and Services | Requires you to talk to a sales team | Unknown | Unknown | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Cisco Secure Email DefenseAdvanced protection to safeguard your inboxes | Requires you to talk to a sales team | Unknown | 100 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
BarracudaCybersecurity Solutions: Email, Apps, Network, Data | Requires you to talk to a sales team | Unknown | 100 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
SpamTitanEmail Security Solutions | Rrequires you to talk to a sales team | Unknown | 150 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
ProofpointThe leader in human-centric cybersecurity | See Proofpoint plans (requires you to talk to a sales team) (according to a Reddit thread it may cost upwards of +$1000-2000 per month) | Unknown | 150 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
MimecastEmail & Collaboration Security | See Mimecast plans (requires you to talk to a sales team) (according to a Reddit thread it may cost upwards of +$1000-2000 per month) | Unknown | 200 MB | No | No | No | No | No | ❌ Requires 3rd party | ❌ Requires 3rd party | ❌ Requires 3rd party | Yes | No | No | No |
Email Spam Filtering Service Screenshots
Forward Email
Forward Email is an open-source email service. Their official description reads: Email for everyone
Spam Scanner
Spam Scanner is a closed-source email service. According to their website: Spam Scanner is the best anti-spam, email filtering, and phishing prevention service
Egress
Egress is a closed-source email service. Their official description reads: Stop more advanced phishing attacks
Mailinblack
Mailinblack is a closed-source email service. Its description from its website is: Your cybersecurity is our job
Altospam
Altospam is a closed-source email service. Their website says: Antispam, Antivirus & Anti-Phishing Software
Heimdal
Heimdal is a closed-source email service. Its description from its website is: One Platform. Total Security.
Check Point Avanan
Check Point Avanan is a closed-source email service. Their official description reads: Prevent Phishing before the Inbox with Email Security from Check Point
Trustifi
Trustifi is a closed-source email service. Their official description reads: Protect Your Business Emails with AI-Powered Security
Libraesva
Libraesva is a closed-source email service. Their official description reads: Email Security, Email Archiving, Phishing Awareness, DMARC
OOPSpam
OOPSpam is a closed-source email service. According to their website: Automate your Spam and Abuse Detection
DuoCircle
DuoCircle is a closed-source email service. Their official description reads: Protect Email Against Phishing, Spam and Malware
N‑able Mail Assure
N‑able Mail Assure is a closed-source email service. Its description from its website is: Email protection to help you secure and scale
Vade Secure
Vade Secure is a closed-source email service. Its description from its website is: Simple, Sophisticated Email Security Powered by AI
Spam Hero
Spam Hero is a closed-source email service. Their official description reads: Cloud-Based Spam Filtering
Abnormal Security
Abnormal Security is a closed-source email service. Their website says: Cloud Email Security - Block Malicious Email Attacks
Darktrace
Darktrace is a closed-source email service. According to their website: Cyber security that learns you
Fortinet
Fortinet is a closed-source email service. Their official description reads: Global Leader of Cybersecurity Solutions and Services
Cisco Secure Email Defense
Cisco Secure Email Defense is a closed-source email service. Their website says: Advanced protection to safeguard your inboxes
Barracuda
Barracuda is a closed-source email service. According to their website: Cybersecurity Solutions: Email, Apps, Network, Data
SpamTitan
SpamTitan is a closed-source email service. Its description from its website is: Email Security Solutions
Proofpoint
Proofpoint is a closed-source email service. Their official description reads: The leader in human-centric cybersecurity
Mimecast
Mimecast is a closed-source email service. Its description from its website is: Email & Collaboration Security
