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server:mail [2018/03/04 20:33] – Reorganize this page a bit. Mention the POP3 server #nospam feature. Removed the (empty) ListServer section from this page. digital manserver:mail [2021/07/31 19:49] – [Special Addresses] Correct the tag-block filename (its usernum.smtpblock not .smtptags) digital man
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   cnnreport    sub:dove-deb   cnnreport    sub:dove-deb
      
-==== Tags ====+==== Special Addresses ==== 
 +Some specially formatted destination addresses (''RCPT TO'' addresses) are recognized and treated specially by the Synchronet SMTP server.
  
-Incoming email is scanned for Toheaders in the format ''<name>#<tag>@host''+=== FidoNet === 
 +If the system supports [[network:FidoNet]]-style networking (has at least one address configured in [[util:SCFG]]->Networks->FidoNet->Addresses), then incoming FidoNet netmail messages are recognized with one of the following formats:
  
-Tag is extracted, and if it is not found in ''data/user/<usernum>.smtptags'' it is +  * ''//<name>//@f//<node>//.n//<net>//.z//<zone>//.fidonet'' 
-sent to the user.  If it DOES match a line in the smtptags file, the email +  * ''//<name>//@p//<point>//.f//<node>//.n//<net>//.z//<zone>//.fidonet''
-is rejected with a "no such user" error.+
  
-Using this this feature allows you (the sysop) to easily create "temporary" email addresses.  Once you +Example: ''rob.swindell@f705.n103.z1.fidonet'' 
-start recieving spam on one tag, just disable it.+ 
 +Note: the ''.fidonet'' host suffix is required even if the destination network is an //othernet// (not technically part of FidoNet proper). This is a "virtual" TLD, no DNS lookup is performed by the mailserver for destination hostnames with this suffix. 
 + 
 +=== Tags === 
 + 
 +The Synchronet Mail Server recognizes the incoming special address format: ''//<name>//#//<tag>//@//<host>//'' 
 + 
 +The //<tag>// is extracted from the address and if it is **not** found in the ''data/user/<usernum>.smtpblock'' file, the mail message is 
 +sent to the destination user.  If the tag matches a line in the ''.smtpblock'' file, the email is rejected by the mail server with a "no such user" error. 
 + 
 +This feature allows you (the sysop) to easily create and use "temporary" email addresses without requiring additional user accounts.  Once you start receiving spam with a tag, just disable that tag by adding it to your ''.smtpblock'' file.
  
 ==== Anti-SPAM ==== ==== Anti-SPAM ====
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 download and delete those messages (which could potentially include download and delete those messages (which could potentially include
 false positives). false positives).
 +
 +===== sbbs.ini =====
 +
 +The ''[mail]'' section of the ''[[dir:ctrl]]/[[config:sbbs.ini]]'' file supports the following configuration settings (''key = value'' lines):
 +
 +^ Key               ^ Default Value ^ Description ^
 +| AutoStart         | true          | Automatically start up the server (manual is only supported in [[monitor:sbbsctrl]]) |
 +| Interface         | [global]      | Comma-separated list of IPv4 and IPv6 network interfaces to listen on for incoming SMTP/SMTPS connections |
 +| POP3Interface     | Interface     | Comma-separated list of IPv4 and IPv6 network interfaces to listen on for incoming POP3/POP3S connections |
 +| OutboundInterface | [global]      | IPv4 network interface to use for outgoing SMTP/SMTPS connections (0.0.0.0 = //any interface//) |
 +| SMTPPort          | 25            | TCP port number to listen on for incoming SMTP mail-delivery connections |
 +| SubmissionPort    | 587           | TCP port number to listen on for incoming SMTP mail-submission connections |
 +| TLSSubmissionPort | 465           | TCP port number to listen on for incoming SMTPS (encrypted) mail-submission connections |
 +| POP3Port          | 110           | TCP port number to listen on for incoming POP3 mail-retrieval connections |
 +| TLSPOP3Port       | 995           | TCP port number to listen on for incoming POP3S (encrypted) mail-retrieval connections |
 +| MaxClients        | 10            | Maximum number of simultaneous incoming TCP sessions supported |
 +| MaxConcurrentConnections | 0      | Maximum number of concurrent connections (without login) from the same IP address (0 = unlimited) |
 +| MaxInactivity     | 120           | Maximum amount of TCP session inactivity before timeout and disconnection (in seconds) |
 +| MaxDeliveryAttempts | 50          | Maximum number of outbound mail delivery attempts before mail is bounced back to sender |
 +| RescanFrequency     | 60M         | Frequency (in seconds) of mail base re-scans for outbound mail to be sent/re-sent |
 +| SemFileCheckFrequency | 2         | Frequency (in seconds) of checks for semaphore files |
 +| LinesPerYield         | 10        | Interval (in message body lines) of thread-yields during message receive (0 = none) |
 +| MaxRecipients         | 100       | Maximum number of mail recipients for a single inbound SMTP mail message |
 +| MaxMsgSize            | 20MB      | Maximum size of incoming SMTP mail messages, in bytes |
 +| MaxMsgsWaiting        | 100       | Maximum number of messages allowed in a (non-W-exempt) user's inbox |
 +| ConnectTimeout        | 30        | Timeout (in seconds) before blocked outbound SMTP/TCP connections are aborted |
 +| HostName              | [global]  | Hostname of this server |
 +| TempDirectory         | [global]  | Directory to use for the storage of temporary files |
 +| RelayServer                     | Hostname or IP address of SMTP server to relay outbound mail through (requires ''RELAY_TX'' option) |
 +| RelayPort             | 25        | TCP port number to connect with when relaying mail to RelayServer |
 +| RelayUsername                   | Username used to authenticate with RelayServer |
 +| RelayPassword                   | Password used to authenticate with RelayServer |
 +| DNSServer             | <auto>    | IP address of DNS server used to discover mail-exchange servers for outbound mail destinations |
 +| DefaultUser                     | Default recipient of mail for unrecognized recipient names (blank = none) |
 +| DefaultCharset        |           | Default MIME Content-Type ''charset'' value when unspecified (e.g. ''IBM437'') |
 +| DNSBlacklistHeader    | X-DNSBL   | Header value to add to incoming mail messages from DNS-Blacklisted servers |
 +| DNSBlacklistSubject   | SPAM      | Word to insert into beginning of subject of mail messages from DNS-Blacklisted servers |
 +| POP3Sound                       | WAV file to play upon incoming POP3 connections (Windows only) |
 +| InboundSound          |           | WAV file to play upon incoming SMTP/SMTPS connections (Windows only) |
 +| OutboundSound                   | WAV file to play upon outgoing SMTP/SMTPS connections (Windows only) |
 +| NewMailNotice         | "New e-mail from <%s>\r\n" | Format of telegram to send users upon receipt of incoming mail message |
 +| ForwardNotice         | "and it was forwarded to: %s" | Additional telegram text to send to recipient of automatically forwarded mail |
 +| JavaScript*           | [global]  | JavaScript-related settings for external mail processing |
 +| LogLevel              | [global]  | Minimum severity of log messages to be displayed / stored |
 +| BindRetryCount        | [global]  | Maximum number of TCP port bind attempts before failure |
 +| BindRetryDelay        | [global]  | Delay (in seconds) between TCP port bind retries |
 +| LoginAttempt*         | [global]  | Failed login attempt throttling / filtering / banning |
 +| Options               | ''ALLOW_POP3'' | Mail server option flags (see below for details) |
 +
 +==== Options ====
 +
 +The ''Options'' key of the ''[mail]'' section of the ''[[dir:ctrl]]/[[config:sbbs.ini]]'' file supports the following option flags (separated by a ''|'' character):
 +
 +^ Option              ^ Description ^
 +| USE_SUBMISSION_PORT | Support mail submissions on the SMTP submission port |
 +| TLS_SUBMISSION      | Support incoming SMTP Submissions (encrypted) connections |
 +| ALLOW_POP3          | Support incoming POP3 connections for BBS users to use mail clients to retrieve the mail in their BBS inbox |
 +| DEBUG_POP3          | Log all POP3 activity (Debug log level) |
 +| TLS_POP3            | Support incoming POP3S (POP3/TLS) connections |
 +| DEBUG_TX            | Log all transmissions (Debug log level) | 
 +| DEBUG_RX_HEADER     | Log headers of all received messages (Debug log level)|
 +| DEBUG_RX_BODY       | Log body text of all received messages (Debug log level)|
 +| DEBUG_RX_RSP        | Log all received responses (Debug log level) |
 +| ALLOW_RX_BY_NUMBER  | Allow email to be received by user number in addition to name/alias (not recommended) |
 +| ALLOW_SYSOP_ALIASES | Allow email to received for various administrative aliases (e.g. "sysop", "postmaster") to be delivered to the sysop |
 +| NO_NOTIFY           | Do not send telegrams to users notifying them of newly received email |
 +| NO_HOST_LOOKUP      | Do not resolve/log hostnames of incoming TCP connections |
 +| USE_TCP_DNS         | Use TCP instead of UDP for MX-record queries using DNS |
 +| NO_SENDMAIL         | Do not send outbound Internet email |
 +| ALLOW_RELAY         | Allow authenticated users to relay Internet email through this server |
 +| SMTP_AUTH_VIA_IP    | Authenticate users via IP address when supported |
 +| DNSBL_REFUSE        | Actively refuse all mail sessions from DNS-blacklisted servers |
 +| DNSBL_IGNORE        | Ignore (silently-discard) mail from DNS-blacklisted servers |
 +| DNSBL_BADUSER       | Block (report "invalid mailbox") mail from DNS-blacklisted servers |
 +| DNSBL_CHKRECVHDRS   | Check "Received" headers in mail messages for DNS-blacklisted servers |
 +| DNSBL_THROTTLE      | Throttle mail sessions from DNS-blacklisted servers |
 +| DNSBL_SPAMHASH      | Store hashes of confirmed SPAM messages for later comparison |
 +| SEND_INTRANSIT      | Send mail that is marked 'in-transit' (not recommended) |
 +| RELAY_TX            | Relay outbound SMTP mail through an intermediary SMTP RelayServer |
 +| RELAY_AUTH_PLAIN    | When relaying mail to a RelayServer, use SMTP-PLAIN AUTH |
 +| RELAY_AUTH_LOGIN    | When relaying mail to a RelayServer, use SMTP-LOGIN AUTH |
 +| RELAY_AUTH_CRAM_MD5 | When relaying mail to a RelayServer, use SMTP-CRAM_MD5 AUTH |
 +| NO_AUTO_EXEMPT      | Do not automatically exempt outbound mail recipients in ''dnsbl_exempt.cfg'' |
 +| NO_RECYCLE          | Do not allow this server to be automatically recycled by external event |
 +| KILL_READ_SPAM      | Mark received SPAM messages for "Kill after read" |
 +| MUTE                | Disable all sound (WAV) files from playing |
 +
 +
 +
  
 ===== See Also ===== ===== See Also =====
server/mail.txt · Last modified: 2024/03/04 18:30 by digital man
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