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Vendor cryodrift
Package mailserver
Short Description simple pop3 and smtp servers with encryption
License MIT

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Informations about the package mailserver

POP3/SMTP Test Servers (Implicit TLS)

Minimal POP3 and SMTP servers intended for local account-setup and client integration tests. POP3 serves messages from a filesystem maildir. SMTP accepts messages and relays them using src/mail/Smtp.

This is not for production use.

What it does

POP3: Listens on a TLS socket (implicit TLS) — default 0.0.0.0:1995.
POP3: Serves messages from a configurable maildir directory (recursively scanned, oldest first).
POP3: Accepts any USER/PASS (no verification) — for testing only.
POP3: Supports core commands: CAPA, USER, PASS, STAT, LIST, UIDL, RETR, TOP, NOOP, RSET, QUIT.
SMTP: Listens on implicit TLS (default 0.0.0.0:465). Accepts EHLO/HELO, AUTH (accepts any), MAIL FROM, RCPT TO, DATA, RSET, NOOP, QUIT.
SMTP: On end of DATA, relays via \cryodrift\mail\Smtp using configured user accounts.
SMTP (receiver mode): Optionally saves each received message to a Maildir so POP3 can serve it.
POP3: Multi-line responses and dot-stuffing per POP3.

Requirements

PHP 8.4+
TLS certificate and key files (self-signed is fine for local testing)
A maildir-like folder with message files (POP3)
add domain to hosts eg: 127.0.0.1 mail.lab.lan
create cert for this domain

Minimal usage examples

POP3

php vendor/bin/cryodrift.php -echo /mailserver/cli/ pop3

SMTP

php vendor/bin/cryodrift.php -echo /mailserver/cli/ smtp

Connecting for quick tests

POP3 over TLS (implicit):

SMTP over TLS (implicit):

Maildir notes (POP3)

The server recursively scans the configured maildir and serves every file it finds as a message.
Messages are sorted by file modification time (oldest first).
UIDL uses the filename (before any :2, suffix) for stability.

Limitations

POP3: No user authentication or authorization (accepts any credentials). Read-only (DELE disabled).
SMTP: Accepts any AUTH and relays based on local account config; intended only for local tests.
Designed for local/test environments only.

All versions of mailserver with dependencies

PHP Build Version

Package Version

Version 0.1.13 Release 19. Jan 2026
create-project require 0 people chose require and
0 people chose create-project.

Download

Download latest version of mailserver from vendor cryodrift

Requires php Version >=8.4
cryodrift/fw Version ^0.1.1
cryodrift/user Version ^0.1.1
cryodrift/mailsend Version ^0.1.1

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