MailPump

A service that monitors a mailbox for messages and will automatically move them to another, usually on a different server.

Used to liberate your mail from proprietary providers that don't provide automatic forward-and-delete functionality, i.e. most of them.

Usage

MailPump has two usage modes, single, and multi. Single operates in a one-to-one fashion, i.e. One connection to the source and one connection to the destination. Many single instances pointed at the same place can potentially overwhelm the destination server. For this case, multi mode should be preferred. In multi mode, multiple source servers can be specified, as well as a single destination server, thus relieving pressure on the target.

For multi-mode documentation, please see here.

NAME:
   mailpump run - Run the pump

USAGE:
   mailpump run [command options] [arguments...]

OPTIONS:
   --batch-size value                   deletion batch size (default: 15) [$MAILPUMP_BATCH_SIZE]
   --dest-auth-method value             dest auth method (default: "LOGIN") [$MAILPUMP_DEST_AUTH_METHOD]
   --dest-debug value                   display dest debug info (default: "persistent") [$MAILPUMP_DEST_DEBUG]
   --dest-oauth2-client-id value        dest oauth2 client id [$MAILPUMP_DEST_OAUTH2_CLIENT_ID]
   --dest-oauth2-client-secret value    dest oauth2 client secret [$MAILPUMP_DEST_OAUTH2_CLIENT_SECRET]
   --dest-oauth2-provider value         dest oauth2 provider (custom) (default: "custom") [$MAILPUMP_DEST_OAUTH2_PROVIDER]
   --dest-oauth2-scopes value           dest oauth2 scopes  (accepts multiple inputs) [$MAILPUMP_DEST_OAUTH2_SCOPES]
   --dest-oauth2-token-url value        dest oauth2 token url [$MAILPUMP_DEST_OAUTH2_TOKEN_URL]
   --dest-password value                dest imap password [$MAILPUMP_DEST_PASSWORD]
   --dest-password-file value           dest imap password file [$MAILPUMP_DEST_PASSWORD_FILE]
   --dest-tls-skip-verify               skip dest tls verification (default: false) [$MAILPUMP_DEST_TLS_SKIP_VERIFY]
   --dest-transport value               dest imap transport (persistent, standard) (default: "persistent") [$MAILPUMP_DEST_TRANSPORT]
   --dest-url value                     dest url [$MAILPUMP_DEST_URL]
   --dest-username value                dest imap username [$MAILPUMP_DEST_USERNAME]
   --fetch-buffer-size value            fetch buffer size (default: 20) [$MAILPUMP_FETCH_BUFFER_SIZE]
   --fetch-max-interval value           maximum interval between fetches. can abort IDLE (default: 5m0s) [$MAILPUMP_FETCH_MAX_INTERVAL]
   --idle-fallback-interval value       fallback poll interval for servers that don't support IDLE (default: 1m0s) [$MAILPUMP_IDLE_FALLBACK_INTERVAL]
   --log-format value                   log format (text/json) (default: "text") [$MAILPUMP_LOG_FORMAT]
   --log-level value                    log level (default: "info") [$MAILPUMP_LOG_LEVEL]
   --source-auth-method value           source auth method (default: "LOGIN") [$MAILPUMP_SOURCE_AUTH_METHOD]
   --source-debug value                 display source debug info (default: "persistent") [$MAILPUMP_SOURCE_DEBUG]
   --source-oauth2-client-id value      source oauth2 client id [$MAILPUMP_SOURCE_OAUTH2_CLIENT_ID]
   --source-oauth2-client-secret value  source oauth2 client secret [$MAILPUMP_SOURCE_OAUTH2_CLIENT_SECRET]
   --source-oauth2-provider value       source oauth2 provider (custom) (default: "custom") [$MAILPUMP_SOURCE_OAUTH2_PROVIDER]
   --source-oauth2-scopes value         source oauth2 scopes  (accepts multiple inputs) [$MAILPUMP_SOURCE_OAUTH2_SCOPES]
   --source-oauth2-token-url value      source oauth2 token url [$MAILPUMP_SOURCE_OAUTH2_TOKEN_URL]
   --source-password value              source imap password [$MAILPUMP_SOURCE_PASSWORD]
   --source-password-file value         source imap password file [$MAILPUMP_SOURCE_PASSWORD_FILE]
   --source-tls-skip-verify             skip source tls verification (default: false) [$MAILPUMP_SOURCE_TLS_SKIP_VERIFY]
   --source-transport value             source imap transport (persistent, standard) (default: "persistent") [$MAILPUMP_SOURCE_TRANSPORT]
   --source-url value                   source url [$MAILPUMP_SOURCE_URL]
   --source-username value              source imap username [$MAILPUMP_SOURCE_USERNAME]

Authentication

MailPump supports three authentication methods: LOGIN, PLAIN, and OAUTHBEARER, which should be passed to the --source-auth-method and --dest-auth-method parameters:

LOGIN

The LOGIN authentication method corresponds to the IMAP LOGIN command¹.

Example parameters:

Parameter	Value	Required
*-auth-method	LOGIN	Yes
*-username	joe.bloggs	Yes
*-password	PassW0Rd1	Yes

PLAIN

The PLAIN authentication method corresponds to the SASL PLAIN mechanism².

Example parameters:

Parameter	Value	Required
*-auth-method	PLAIN	Yes
*-username	joe.bloggs	Yes
*-password	PassW0Rd1	Yes

OAUTHBEARER

The OAUTHBEARER authentication method corresponds to the SASL OAUTHBEARER mechanism³.

MailPump can be configured to use a custom OAuth2 provider. Built-in providers may be added in future releases.

Parameter	Example	Required
*-oauth2-provider	custom	Yes
*-oauth2-client-id	mailpump	If *-oauth2-provider=custom
*-oauth2-client-secret	d2baf3d2-5810-4dd1-afec-3a0101b28980	If *-oauth2-provider=custom
*-oauth2-token-url	https://server.example.com/oauth2/token	If *-oauth2-provider=custom
*-oauth2-scopes4	imap	If *-oauth2-provider=custom
*-username	joe.bloggs	Yes
*-password5	b2F1dGgyLXJlZnJlc2gtdG9rZW4K	Yes

OAuth2 Login

The mailpump oauthlogin command will initiate an OAuth2 login and print a token suitable for passing to *-password.

NAME:
   mailpump oauthlogin - Generate an OAuth2 Token

USAGE:
   mailpump oauthlogin [command options] [arguments...]

OPTIONS:
   --provider value       provider (custom) (default: "custom") [$MAILPUMP_PROVIDER]
   --client-id value      client id [$MAILPUMP_CLIENT_ID]
   --client-secret value  client secret [$MAILPUMP_CLIENT_SECRET]
   --token-url value      token url [$MAILPUMP_TOKEN_URL]
   --scopes value         scopes [$MAILPUMP_SCOPES]
   --help, -h             show help (default: false)

Provider URL Examples

Provider	URL
Generic	imap[s]://hostname[:port]/mailbox/path
Migadu	imaps://imap.migadu.com/INBOX
Yahoo!	imaps://imap.mail.yahoo.com/INBOX
Outlook	imaps://outlook.office365.com/INBOX
GMail	imaps://imap.gmail.com/INBOX

License

Copyright © 2022 Zane van Iperen

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2, and only version 2 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Footnotes

1. https://datatracker.ietf.org/doc/html/rfc3501#section-6.2.3 ↩

2. https://datatracker.ietf.org/doc/html/rfc4616 ↩

3. https://datatracker.ietf.org/doc/html/rfc7628 ↩

4. This may be specified multiple times to add multiple scopes. When configuring via environment variable, separate the values with commas. ↩

5. This should be a base64-encoded OAuth2 Refresh Token. ↩