What is Claws?

It is Free Software and is available for a variety of Unix-type platforms, and Windows. You can download Claws Mail from the Claws Mail website.

Claws Mail aims to be feature rich, fast, and stable. It has IMAP and POP support, multiple account support, colored labels, spell checking, filtering, and support for OpenPGP encryption.

Setup Claws Mail

The First Time – Setup Wizard

The first time you run Claws Mail, the setup wizard will walk you through setting up an account. If the wizard does not open, see section “Manual Account Creation” below.

  1. Enter your name/alias and e-mail address on the first page
  2. Click “Forward” to advance to the next screen
  3. Choose server type as POP3 or IMAP (IMAP leaves mail on server, POP3 downloads it locally – this means IMAP is a good choice if you have multiple machines accessing the mailbox and POP3 is a slightly better choice for privacy, the POP3 user experience is much faster and it unburdens your Mail Passwords)
  4. Enter for the Server address (both for IMAP and POP3)
  5. Enter your username (without and password
  6. Select Use SSL to connect to receiving server and also select Use SSL via STARTTLS
  7. Click Forward to advance to the next screen
  8. Enter for the SMTP server address
  9. Select Use authentication (you can leave the SMTP username and password fields blank)
  10. Select Use SSL to connect to receiving server" and also select "Use SSL via STARTTLS
  11. Click Forward to advance to the next screen
  12. Click Save to complete the process

Manual Account Creation

While running Claws Mail select Configuration > Create New Account from the menubar.

  1. Basic Settings – enter a name for your account, enter your name, mail address, select POP3 or IMAP, enter for both the “Server for receiving” and “SMTP server (send)” fields, and your userid (without and password

  1. Send Settings – select SMTP Authentication

  1. SSL Settings – Select STARTTLS for both POP3 and SMTP.

  1. Advanced settings – Change the SMTP port to 587 (POP3 can stay as 110)

  1. Click “OK” to finish adding your new account

First Time, SSL Certificates

When checking your mail for the first time, and also sending your first message, you will see an SSL confirmation dialog. Click View certificate (the fingerprint shown on the image may be outdated):

On first use claws Mail will store these certificates and let you know if they ever change which may indicate an attempted man-in-the-attack, or just that updated their certificates. Every time you get this SSL pop-up, verify the fingerprints with the ones published by Riseup]]!

You’re Done!

If you are using IMAP everything should just work automatically. If you are using POP3 click the “Get Mail” icon in the toolbar to refresh your mail.

Enhance your email security

  • Encrypt your mail! For enhanced message security use Encrypted Email.
  • There are many vulnerabilities with how secure connections work. If you need high security, you should always connect to Riseup services using the Riseup VPN. This will prevent a long list of potential attacks against your communication.
  • To enhance connection security you can use Onion Service configuration to connect to Riseup’s .onion services for IMAP and SMTP. Look for the onion address for and addresses and use those instead. Note: * SMTP port 465 is often blocked by exit nodes, but port 587 is less frequently blocked. If you have a problem sending mail, try port 587 or configure your client to use Riseup’s email hidden service in place of the regular domain. This is better than sending traffic through a Tor exit as it is MITM resistant, but it will generate certificate errors on the client side.