Email Features
- Masked Aliases: Create normal looking custom email addresses at will with a choice of 30+ domains, each with catch-all functionality
- Account Aliases: Use your account name across all available domains (turn on or off domains and catch-alls at will)
- Unlimited Hosted Domains: Host your own domains with full feature integration
- Catch-all Addressing: Receive mail to any address at your domains
- Full Catch-All Control: Block/Allow aliases and addresses. Easily manage catch-alls as blocklist or whitelist
- SMTP-level Mail Control: Block addresses, domains, or TLDs with User Unknown rejection at the connection. Both blocked from addresses and blocked incoming aliases are handled this way
- Scheduled Send: Schedule anything that can be sent in a mail (plain text, pgp, formatted text, attachments, etc) to be sent in the future, automatically detects if the identity has a custom SMTP server and will use that
- Secure Link: Automatically password (one time pad)-encrypt attachments client-side with AES-256-GCM using the webcrypto api. Encrypted contents are uploaded to our servers. A secure random link is appended to the email body. The password (one time pad) is required to download and decrypt. The password/pad is not stored on our servers. You will get notified of all downloads
- Fetch Mail: Automatically retrieve email via POP or IMAP from other services with filtering and encryption options
- Advanced Sieve Filters: Comprehensive mail filtering with custom rules, including the ability to auto-pgp encrypt with your choice of public key as an action
- Auto-forwarding: Forward all mail to existing accounts
- Out of Office: Easily create and schedule Out of Office replies
- Archive: Organize and archive important mail by year, year/month, sender, original folder, original folder and year, or original folder and year/month
- Attachment Management: Remove, download, or view individual email attachments. Option to remove all attachments
- Quick Responses: Save templates for fast replies
- Identity SMTP: Ability to set specific SMTP servers per identity if needed
- Drag-&-drop Message Management: Drag and drop your messages between folders
- Import/Export Mail: Import/Export mail in eml, mbox, or maildir format
- Calendar Integration: Multiple calendars with event management, invitations, and reminders. Easy iCal import/export
- Task Management: Create tasks from emails with due dates and priorities. Easy iCal import/export
- Notes: Create and edit Notes in plain text, html, or markdown. Upload images, pdfs, and more. Download any. Easily send Note as attachment. Search function
- Contact Management: Integrated address book with import/export
- Email-to-Calendar/Tasks: Convert emails directly to events or tasks
- Built-in Document Viewers: PDF and ODF viewers with annotation tools
- Control POP/IMAP access: Enable and disable pop and or imap access at will, including ability to restrict access via CIDR addressing
- Data Portability: Import/export everything in standard formats
- Mobile-Responsive Interface: Works like an app on any device; computer, tablet, or phone. Includes ability to customize layout
- Localization: Webmail and all features are available in 80+ languages
Security & Encryption
- At-Rest Encryption: All mail individually encrypted with AES-256-GCM, headers and all
- Zero-Access PGP Encryption: Auto-encrypt incoming mail with your choice of public keys. Encrypt all, by address, or by filter action
- End-to-End PGP/GPG: Full PGP support with Mailvelope compatibility for zero trust
- Secure Link: Password-encrypt attachments client-side with AES-256-GCM. Encrypted contents are uploaded to our servers. A secure random link is appended to the email body. The password is required to download and decrypt. The password is not stored on our servers. You get notified of all downloads
- Two-Factor Authentication (TOTP): Enhanced login security
- Header Privacy Protection: Remove tracking headers automatically
- Custom Header Control: Add, remove, or modify outgoing email headers regardless of what email app you use
- IP Address Masking: Hide your IP when fetching/sending through other services
- XSS attack protection: Protection from cross-site scripting and cross-site request forgery
- Remote Image and Tracking protection: Protection from remotely hosted images, tracking pixels and more
- No Remote Resources: Everything is local; fonts, icons, scripts, and css. Everything built from open source software that we have customized. There are no license calls, telemetry, or analytics. Nothing makes any external calls
- Cryptographic Address Verification: A unique cryptographic for each sender to help visually identify forged addresses
- Encrypted Connections: Only encrypted connections to mail and web are allowed. It's 2025, everything valid should now use ssl (we have operated this way for some time). In addition, all offered domains and catch-alls use dnssec, spf, dkim, dmarc.
- Perfect Forward Secrecy: All encrypted connections use PFS
Anti-Spam & Security
- Multi-layer Spam Protection: Connection-level bot protection + content filtering
- SpamAssassin Control: Full customization of the leading anti-spam solution
- ClamAV Antivirus: Comprehensive malware protection
- Language-based Filtering: Mark mail in unwanted languages as spam
- Auto-learning Filters: Bayesian filtering that improves over time as you train it
- DNS Blocklists: Community-maintained reputation filtering
- Custom Spam Rules: Create your own filtering criteria
- SPF/DKIM/DMARC: Full support for spf, dmarc, and dkim for all domains and catch-alls
Additional Services (Offered on Cotse.Net Domain)
- cPanel Web Hosting: Professional hosting with one-click installers
- SSH Tunneling: Encrypted connections with multiple proxy options
- SOCKS5 Proxy: High-speed proxy with authentication support
- VPN Service: OpenVPN-based service across multiple countries