Mail Setting
Overview
Exim Configuration Manager that allows system administrators to manage and customize the Exim mail server—the default Mail Transfer Agent (MTA)It provides an accessible and structured way to control how Exim handles sending, receiving, and processing emails on the server.
Basic Editor
All
This tab displays all available settings. To filter the displayed settings, select a category tab. You can also use the Find text box to search for a specific Basic Editor setting.
Acls
The ACL (Access Control List) Options allow you to restrict who can send mail to your server. These settings help reduce bandwidth usage, block spam, and prevent emails with forged sender addresses (spoofed emails).
Note: Any email rejected at SMTP time will be discarded by the system.
Access Lists
These settings further limit who sends mail to your server.
Filters
These settings allow you to select and configure filters that can block spam and potentially dangerous attachments.
These settings allow you to configure specific mail server behaviors. For example, enabling sender rate logging in the Exim mainlog helps monitor email activity and identify potential issues or spam sources.
RBLs
These settings allow you to configure your mail server to check incoming mail against the available Real-time Blackhole Lists (RBLs). Your server blocks the incoming messages if the IP address or hostname matches an RBL entry.
RBL servers store lists of spam-heavy IP addresses and hostnames so that you can easily block them.
Security
These settings allow you to configure security settings for your mail server.
Allow weak SSL/TLS ciphers >> These options manage how secure connections are handled by the mail server. You can choose to allow weak SSL/TLS ciphers (not recommended due to PCI non-compliance) and enforce that clients must use SSL or STARTTLS before authentication. By default, weak ciphers are disabled, and secure connections are required.
Options for OpenSSL >> This setting configures SSL and TLS protocols in OpenSSL that Exim will use to securely communicate with client software. Either select the default setting or enter a space-separated list of protocols that you wish to disallow in the text box.
SSL/TLS Cipher Suite List >> This setting allows you to configure the cipher suites in OpenSSL that Exim uses to securely communicate with client software. Either select the default setting or enter a cipher suite that you wish to use.
SpamAssassin
SpamAssassin is an intelligent spam filtering system used to identify and filter out unwanted or malicious emails. It works by analyzing email content and assigning a spam score based on various rules and criteria.
Key Configuration Options:
Enable/Disable SpamAssassin:>>Activates the spam filtering system. (Currently disabled by default.)
Force Enable SpamAssassin >>This setting enables SpamAssassin for all accounts on the server, preventing users from disabling it. By default, this option is turned Off.
SpamAssassian message size threshold to scan (in KB) >> This setting allows you to set the maximum size, in kilobytes (KB), for messages that SpassAssian scans. it is generallu inefficient to scan large messages because spam message are typically small (4 KB or smaller).
This settings defaults to 1000KB
Scan outgoing messages for spam and reject based on the SpamAssassin internal spam_score setting>>
This setting enables SpamAssassin to scan outgoing emails and reject them if they exceed the system's internal spam score threshold. It helps prevent compromised accounts from sending spam and protects the server’s reputation.
Scan outgoing messages for spam and reject based on defined SpamAssassin score (Minimum: 0.1; Maximum: 99.9)>>
This setting lets you define a SpamAssassin score threshold for rejecting messages sent to external (non-local) domains. Enter a value between 0.1 and 99.9 (one decimal place only) to activate this filter.
Do not forward mail to external recipients if it matches the SpamAssassin internal spam_score setting>>
This setting allows SpamAssassin to scan messages in the forwarder queue and reject those with a spam score higher than the internal threshold (default: 5). This helps prevent spam from being forwarded through your server.
Default setting: Off
Do not forward mail to external recipients based on the defined SpamAssassin score (Minimum: 0.1; Maximum: 99.9)>>
Set a SpamAssassin score threshold to reject forwarded emails to non-local domains. Enter a value between 0.1 and 99.9 (one decimal place).
Default setting: Disabled
Enable BAYES_POISON_DEFENSE SpamAssassin ruleset>> This setting activates the BAYES_POISON_DEFENSE ruleset in SpamAssassin, which helps prevent spammers from manipulating the Bayesian filter by poisoning it with false spam data. Enabling this rule improves the accuracy of spam detection.
Default setting: On
