Dovecot: IMAP, POP3 & SASL Auth Server (Alpine Linux)

dependabot[bot] 2f28301c36 Bump alpine from 3.19.0 to 3.19.1 (#72) 3 weeks ago
.github c9e1661cbc Bump docker/build-push-action from 5.0.0 to 5.1.0 (#69) 3 months ago
CHANGELOG.md 0d596b595c release v1.3.0 2 years ago
Dockerfile 2f28301c36 Bump alpine from 3.19.0 to 3.19.1 (#72) 3 weeks ago
Makefile 01fe5a6104 added makefile for image building, pushing & tagging 3 years ago
README.md f55954105e readme: added links to dovecot docs for individual services 4 years ago
docker-compose.yml 68576a9d6d mount ssl dir 4 years ago
socat-package-log.url d3ad0decc1 upgrade alpine base image from v3.17.3 to v3.18.0 including upgrade of dovecot packages from v2.3.20-r7 to v2.3.20-r10 & socat package from v1.7.4.4-r0 to v1.7.4.4-r1 (see below) 9 months ago

README.md

dovecot ✉️ 🐳

Dovecot: IMAP, POP3, LMTP, SASL Auth & ManageSieve Server

https://www.dovecot.org/

Usage

docker run --name dovecot \
    -p ... \
    -v $PWD/dovecot.conf:/etc/dovecot/dovecot.conf:ro \
    fphammerle/dovecot

Postfix SASL Auth Setup

http://www.postfix.org/SASL_README.html#server_sasl_enable

# dovecot.conf

auth_mechanisms = plain login

passdb {
  # https://wiki.dovecot.org/AuthDatabase/PasswdFile
  # doveadm pw -s BLF-CRYPT -u user -p password
  driver = passwd-file
  args = username_format=%n /etc/dovecot/passwd
}

service auth {
  # https://wiki.dovecot.org/Services#inet_listeners
  inet_listener auth {
    address = *
    port = 12345
  }
}
# postfix main.cf

smtpd_sasl_auth_enable = yes
smtpd_tls_auth_only = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = inet:dovecot:12345

smtpd_relay_restrictions = [...], permit_sasl_authenticated, reject_unauth_destination

Deliver Mail From Postfix to Dovecot via LMTP

https://wiki2.dovecot.org/HowTo/PostfixDovecotLMTP