; smtprelay configuration ; ; All config parameters can also be provided as environment ; variables in uppercase and the prefix "SMTPRELAY_". ; (eg. SMTPRELAY_LOGFILE, SMTPRELAY_LOG_FORMAT) ; Logfile (blank/default is stderr) ;logfile = ; Log format: default, plain (no timestamp), json ;log_format = default ; Log level: panic, fatal, error, warn, info, debug, trace ;log_level = info ; Hostname for this SMTP server ;hostname = localhost.localdomain ; Welcome message for clients ;welcome_msg = ESMTP ready. ; Listen on the following addresses for incoming ; unencrypted connections. ;listen = 127.0.0.1:25 [::1]:25 ; STARTTLS and TLS are also supported but need a ; SSL certificate and key. ;listen = tls://127.0.0.1:465 tls://[::1]:465 ;listen = starttls://127.0.0.1:587 starttls://[::1]:587 ;local_cert = smtpd.pem ;local_key = smtpd.key ; Enforce encrypted connection on STARTTLS ports before ; accepting mails from client. ;local_forcetls = false ; Only use remotes where FROM EMail address in received ; EMail matches remote_sender. ;strict_sender = false ; Socket timeout for read operations ; Duration string as sequence of decimal numbers, ; each with optional fraction and a unit suffix. ; Valid time units are "ns", "us", "ms", "s", "m", "h". ;read_timeout = 60s ; Socket timeout for write operations ; Duration string as sequence of decimal numbers, ; each with optional fraction and a unit suffix. ; Valid time units are "ns", "us", "ms", "s", "m", "h". ;write_timeout = 60s ; Socket timeout for DATA command ; Duration string as sequence of decimal numbers, ; each with optional fraction and a unit suffix. ; Valid time units are "ns", "us", "ms", "s", "m", "h". ;data_timeout = 5m ; Max concurrent connections, use -1 to disable ;max_connections = 100 ; Max message size in bytes ;max_message_size = 10240000 ; Max RCPT TO calls for each envelope ;max_recipients = 100 ; Networks that are allowed to send mails to us ; Defaults to localhost. If set to "", then any address is allowed. ;allowed_nets = 127.0.0.0/8 ::1/128 ; Regular expression for valid FROM EMail addresses ; If set to "", then any sender is permitted. ; Example: ^(.*)@localhost.localdomain$ ;allowed_sender = ; Regular expression for valid TO EMail addresses ; If set to "", then any recipient is permitted. ; Example: ^(.*)@localhost.localdomain$ ;allowed_recipients = ; File which contains username and password used for ; authentication before they can send mail. ; File format: username bcrypt-hash [email[,email[,...]]] ; username: The SMTP auth username ; bcrypt-hash: The bcrypt hash of the pasword (generate with "./hasher password") ; email: Comma-separated list of allowed "from" addresses: ; - If omitted, user can send from any address ; - If @domain.com is given, user can send from any address @domain.com ; - Otherwise, email address must match exactly (case-insensitive) ; E.g. "app@example.com,@appsrv.example.com" ;allowed_users = ; Relay all mails to this SMTP servers. ; If not set, mails are discarded. ; ; Format: ; protocol://[user[:password]@][netloc][:port][/remote_sender][?param1=value1&...] ; ; protocol: smtp (unencrypted), smtps (TLS), starttls (STARTTLS) ; user: Username for authentication ; password: Password for authentication ; remote_sender: Email address to use as FROM ; params: ; skipVerify: "true" or empty to prevent ssl verification of remote server's certificate ; auth: "login" to use LOGIN authentication ; GMail ;remotes = starttls://user:pass@smtp.gmail.com:587 ; Mailgun.org ;remotes = starttls://user:pass@smtp.mailgun.org:587 ; Mailjet.com ;remotes = starttls://user:pass@in-v3.mailjet.com:587 ; Ignore remote host certificates ;remotes = starttls://user:pass@server:587?skipVerify ; Login Authentication method on outgoing SMTP server ;remotes = smtp://user:pass@server:2525?auth=login ; Sender e-mail address on outgoing SMTP server ;remotes = smtp://user:pass@server:2525/overridden@email.com?auth=login ; Multiple remotes, space delimited ;remotes = smtp://127.0.0.1:1025 starttls://user:pass@smtp.mailgun.org:587 ; Pipe messages to external command ;command = /usr/local/bin/script