diff --git a/candidates.md b/candidates.md
index 7de16bf..ec820a2 100644
--- a/candidates.md
+++ b/candidates.md
@@ -26,6 +26,10 @@ Components to investigate and evaluate for fit and purpose.
 * [mail-crypt-plugin](https://doc.dovecot.org/configuration_manual/mail_crypt_plugin/)
   > The Mail crypt plugin is used to secure email messages stored in a Dovecot system. Messages are encrypted before written to storage and decrypted after reading. Both operations are transparent to the user.
   > There can be a single encryption key for the whole system or each user can have a key of their own. The used cryptographical methods are widely used standards and keys are stored in portable formats, when possible.
+* [mailserver2/mailserver](https://github.com/mailserver2/mailserver)
+* [docker-mailserver](https://docker-mailserver.github.io/docker-mailserver/edge/introduction/)
+* [Zeyple](https://infertux.com/labs/zeyple/)
+  > ... catches email from the postfix queue, then encrypts it if a corresponding recipient's GPG public key is found. Finally, it puts it back into the queue.
 
 ## Management
 * [Nebula manager](https://nebula-orchestrator.github.io/) (not related to Slack's Nebula)