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• string hostname = 1

  Default hostname to use when saying hello. This is used: 1) To say hello to clients, for aesthetic purposes. 2) As the HELO/EHLO domain on outgoing SMTP connections, so ideally it would resolve back to the server. In practice, it's not a big deal if it isn't, but it makes troubleshooting easier. Default: the system's hostname.

• int64 max_data_size_mb = 2

  Maximum email size, in megabytes. Default: 50.

• repeated string smtp_address = 3

  Addresses to listen on for SMTP (usually port 25). Default: "systemd", which means systemd passes sockets to us. systemd sockets must be named with "FileDescriptorName=smtp".

• repeated string submission_address = 4

  Addresses to listen on for submission (usually port 587). Default: "systemd", which means systemd passes sockets to us. systemd sockets must be named with "FileDescriptorName=submission".

• repeated string submission_over_tls_address = 5

  Addresses to listen on for submission-over-TLS (usually port 465). Default: "systemd", which means systemd passes sockets to us. systemd sockets must be named with "FileDescriptorName=submission_tls".

• string monitoring_address = 6

  Address for the monitoring http server. Do NOT expose this to the public internet. Default: no monitoring http server.

• string mail_delivery_agent_bin = 7

  Mail delivery agent (MDA, also known as LDA) to use. This should point to the binary to use to deliver email to local users. The content of the email will be passed via stdin. If it exits unsuccessfully, we assume the mail was not delivered. Default: "maildrop".

• repeated string mail_delivery_agent_args = 8

  Command line arguments for the mail delivery agent. One per argument. Some replacements will be done. On an email sent from marsnik@mars to venera@venus: - %from% -> from address (marsnik@mars) - %from_user% -> from user (marsnik) - %from_domain% -> from domain (mars) - %to% -> to address (venera@venus) - %to_user% -> to user (venera) - %to_domain% -> to domain (venus) Default: "-f", "%from%", "-d", "%to_user%" (adequate for procmail and maildrop).

• string data_dir = 9

  Directory where we store our persistent data. Default: "/var/lib/chasquid"

• optional string suffix_separators = 10

  Suffix separator, to perform suffix removal of local users. For example, if you set this to "-+", email to local user "user-blah" and "user+blah" will be delivered to "user". Including "+" is strongly encouraged, as it is assumed for email forwarding. Default: "+".

• optional string drop_characters = 11

  Characters to drop from the user part on local emails. For example, if you set this to "._", email to local user "u.se_r" will be delivered to "user". Default: ".".

• string mail_log_path = 12

  Path where to write the mail log to. If "<syslog>", log using the syslog (at MAIL|INFO priority). If "<stdout>", log to stdout; if "<stderr>", log to stderr. Default: <syslog>

• bool dovecot_auth = 13

  Enable dovecot authentication. Domains that don't have an user database will be authenticated via dovecot.

• string dovecot_userdb_path = 14

  Dovecot userdb path. If dovecot_auth is set and this is not, we will try to autodetect it. Example: /var/run/dovecot/auth-userdb

• string dovecot_client_path = 15

  Dovecot client path. If dovecot_auth is set and this is not, we will try to autodetect it. Example: /var/run/dovecot/auth-client

• bool haproxy_incoming = 16

  Expect incoming SMTP connections to use the HAProxy protocol. This allows deploying chasquid behind a HAProxy server, as the address information is preserved.