Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

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server:mail [2025/01/22 17:53] – [External Mail Processors] Fix a couple typos digital manserver:mail [2026/03/17 10:11] (current) – [Anti-SPAM] added signup link for spamhaus nelgin
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 === Special Aliases === === Special Aliases ===
 Recipient names configured in ''[[dir:ctrl]]/[[config:alias.cfg]]'' can be used to match recipient names to specific user account numbers, aliases, external email addresses, or even sub-boards. Recipient names configured in ''[[dir:ctrl]]/[[config:alias.cfg]]'' can be used to match recipient names to specific user account numbers, aliases, external email addresses, or even sub-boards.
- 
-=== User Number === 
-Receiving by user account number is also optionally supported, not not encouraged and disabled by default. 
  
 ==== Special Prefixes ==== ==== Special Prefixes ====
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 When a DNSBL service reports an IP address as "black-listed", any additional DNSBL services/servers are not queried. When a DNSBL service reports an IP address as "black-listed", any additional DNSBL services/servers are not queried.
 +
 +If you have used zen.spamhaus.org in the past, this will no longer work. You will need to apply for a Spamhaus Data Query Service account at https://www.spamhaus.com/data-access/free-data-query-service/ where you will receive a unique key that is used to query their DNS. 
  
 == Exemptions == == Exemptions ==
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 {{:server:SBBSCTRL.mailsrvr.advanced.png?400|}} {{:server:SBBSCTRL.mailsrvr.advanced.png?400|}}
 +
 +==== Archiving ====
 +
 +The Synchronet Mail Server (v3.21+) can automatically archive messages received via SMTP as separate ''.eml'' files in sub-directories of ''[[dir:data]]/user/####/'' (where ''####'' is the recipient or relaying user number).
 +
 +To utilize the mail archive feature, the sysop must set the "Archive Requirements" mail server setting (e.g. in [[util:SCFG]]->Servers->Mail Server) to specify the [[:access:]] requirements of the user or users whose mail should be auto-archived.
 +
 +Notes:
 +  * Messages are archived after being processed by any external mail processors which may have modified the message header or body
 +  * SPAM-tagged messages received for local users are not archived
 +  * Archived messages are stored in ''.eml'' files, plain text files conforming to the RFC-822 internet message standard format
 +  * Messages received for relay by users meeting the archive requirements are be stored in their ''[[dir:data]]/user/####/smtp_relay'' directory (i.e. like an "inbox")
 +  * Messages received for delivery to local users meeting the archive requirements are stored in their ''[[dir:data]]/user/####/smtp_in'' directory (i.e. like an "outbox")
 +  * There's no limit to the number or size of messages that may be archived, so disk consumption could be a concern
 +
  
  
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 The Synchronet Mail Server can be configured via [[util:SCFG]]:Servers->Mail Server: The Synchronet Mail Server can be configured via [[util:SCFG]]:Servers->Mail Server:
  
-<file> +  ╔════════════════════════════════════════════╗ 
-╔════════════════════════════════════════════╗ +  ║            Mail Server Settings            ║ 
-║                 Mail Server                ║ +  ╠════════════════════════════════════════════╣ 
-╠════════════════════════════════════════════╣ +  ║ │Enabled                       Yes         ║ 
-║ │Enabled                       Yes         ║ +  ║ │Log Level                     Info        ║ 
-║ │Log Level                     Info        ║ +  ║ │SMTP Interfaces               0.0.0.0, :: ║ 
-║ │SMTP Interfaces               0.0.0.0, :: ║ +  ║ │SMTP Support                  Port 25     ║ 
-║ │SMTP Support                  Port 25     ║ +  ║ │Submission Support            Port 587    ║ 
-║ │Submission Support            Port 587    ║ +  ║ │Submission/TLS Support        Port 465    ║ 
-║ │Submission/TLS Support        Port 465    ║ +  ║ │POP3 Interfaces               0.0.0.0, :: ║ 
-║ │POP3 Interfaces               0.0.0.0, :: ║ +  ║ │POP3 Support                  Port 110    ║ 
-║ │POP3 Support                  Port 110    ║ +  ║ │POP3/TLS Support              Port 995    ║ 
-║ │POP3/TLS Support              Port 995    ║ +  ║ │Mark Retrieved Mail as Read   Yes         ║ 
-║ │Max Clients                   100         ║ +  ║ │Max Clients                   100         ║ 
-║ │Max Inactivity                2 minutes   ║ +  ║ │Max Inactivity                2 minutes   ║ 
-║ │Max Concurrent Connections    Unlimited   ║ +  ║ │Max Concurrent Connections    Unlimited   ║ 
-║ │Max Recipients Per Message    100         ║ +  ║ │Max Recipients Per Message    100         ║ 
-║ │Max Messages Waiting          100         ║ +  ║ │Max Messages Waiting          100         ║ 
-║ │Max Receive Message Size      20M bytes   ║ +  ║ │Max Receive Message Size      20M bytes   ║ 
-║ │Default Recipient                         ║ +  ║ │Limit Rate of Requests        <disabled>  ║ 
-║ │Receive By User Number        No          ║ +  ║ │Post Recipient                            ║ 
-║ │Receive By Sysop Aliases      No          ║ +  ║ │Default Recipient                         ║ 
-║ │Notify Local Recipients       Yes         ║ +  ║ │Receive By Sysop Aliases      No          ║ 
-║ │Notify Offline Recipients     Yes         ║ +  ║ │Notify Local Recipients       Yes         ║ 
-║ │Allow Users to Relay Mail     No          ║ +  ║ │Notify Offline Recipients     Yes         ║ 
-║ │Lookup Client Hostname        Yes         ║ +  ║ │Allow Users to Relay Mail     No          ║ 
-║ │Check Headers against DNSBL   No          ║ +  ║ │Lookup Client Hostname        Yes         ║ 
-║ │DNS-Blacklisted Servers       Tag Mail    ║ +  ║ │Check Headers against DNSBL   No          ║ 
-║ │Hash DNS-Blacklisted Msgs     No          ║ +  ║ │DNS-Blacklisted Servers       Tag Mail    ║ 
-║ │Kill SPAM When Read           No          ║ +  ║ │Hash DNS-Blacklisted Msgs     No          ║ 
-║ │SendMail Support...                       ║ +  ║ │Kill SPAM When Read           No          ║ 
-║ │Login Requirements                        ║ +  ║ │Spammer IP-Filter Duration    Infinite    ║ 
-║ │JavaScript Settings...                    ║ +  ║ │SendMail Support...           Direct      ║ 
-║ │Failed Login Attempts...                  ║ +  ║ │Login Requirements                        ║ 
-╚════════════════════════════════════════════╝ +  ║ │Archive Requirements                      ║ 
-</file>+  ║ │JavaScript Settings...                    ║ 
 +  ║ │Failed Login Attempts...                  ║ 
 +  ╚════════════════════════════════════════════╝ 
 + 
 +The Synchronet Mail Server "SendMail Thread" can be configured via [[util:SCFG]]:Servers->Mail Server->SendMail Support: 
 + 
 +  ╔═══════════════════════════════════════════╗ 
 +  ║              SendMail Support             ║ 
 +  ╠═══════════════════════════════════════════╣ 
 +  ║ │Enabled                       Yes        ║ 
 +  ║ │Rescan Interval               1 hour     ║ 
 +  ║ │Connect Timeout               30 seconds ║ 
 +  ║ │Auto-exempt Recipients        Yes        ║ 
 +  ║ │Max Delivery Attempts         50         ║ 
 +  ║ │Delivery Method               Direct     ║ 
 +  ╚═══════════════════════════════════════════╝
  
 ... via [[monitor:SBBSCTRL]]:Mail->Configure: ... via [[monitor:SBBSCTRL]]:Mail->Configure:
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 | InboundSound          |           | WAV file to play upon incoming SMTP/SMTPS 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) | | OutboundSound         |           | WAV file to play upon outgoing SMTP/SMTPS connections (Windows only) |
 +| ArchiveRequirements   |           | [[:Access]] Requirements for auto-archiving of non-SPAM mail messages (stored in ''.eml'' format) sent to or from select users |
 | JavaScript*           | [global]  | JavaScript-related settings for external mail processing | | JavaScript*           | [global]  | JavaScript-related settings for external mail processing |
 | LogLevel              | [global]  | Minimum severity of log messages to be displayed / stored | | LogLevel              | [global]  | Minimum severity of log messages to be displayed / stored |
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 | DEBUG_POP3          | Log all POP3 activity (Debug log level) | | DEBUG_POP3          | Log all POP3 activity (Debug log level) |
 | TLS_POP3            | Support incoming POP3S (POP3/TLS) connections | | TLS_POP3            | Support incoming POP3S (POP3/TLS) connections |
 +| NO_READ_POP3        | Do not mark POP3-retrieved mail messages as "Read" |
 | DEBUG_TX            | Log all transmissions (Debug log level) |  | DEBUG_TX            | Log all transmissions (Debug log level) | 
 | DEBUG_RX_HEADER     | Log headers of all received messages (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_BODY       | Log body text of all received messages (Debug log level)|
 | DEBUG_RX_RSP        | Log all received responses (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 | | 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_NOTIFY           | Do not send telegrams to users notifying them of newly received email |

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