1.stalwartlabs / stalwart
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
+328 stars
from 15,297 · score 5.80
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8 repositories by Attention Score · Oct 27, 2026 – Nov 2, 2026 (UTC)
2.curl / curl
A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
+90 stars
from 43,259 · score 4.51
3.docker-mailserver / docker-mailserver
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container.
+35 stars
from 19,680 · score 3.58
4.cypht-org / cypht
Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)
+16 stars
from 1,771 · score 2.83
5.jstedfast / MailKit
A cross-platform .NET library for IMAP, POP3, and SMTP.
+7 stars
from 6,863 · score 2.08
6.Mailu / Mailu
Insular email distribution - mail server as Docker images
+4 stars
from 7,592 · score 1.61
7.dovecot / core
Dovecot mail server
+4 stars
from 1,271 · score 1.61
8.mguessan / davmail
DavMail POP/IMAP/SMTP/CalDAV/CardDAV/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at
+1 stars
from 773 · score 0.69