Email Filtering
To use Avaruus.net’s email server, you can utilize server-side filtering to examine each incoming email message, either directly or guided by an email alias or gateway, and take action based on the email account settings, such as rejecting the message entirely or adding supplementary header information for the user.
Additionally, users can create their own rules for spam filtering within their own email program (client-side filtering). Users should refer to their email program’s own documentation for details.
An administrator (admin) can modify settings for all email accounts on the customer pages. The customer pages list all email addresses for a domain: email accounts and email aliases under the Settings -> Email section. Clicking the “Edit” button for a specific email account allows you to change account-specific settings.
A mailbox user can modify their own email account’s filtering settings (without needing to log in as an administrator on the customer pages) at https://webmail.avaruus.net/asetukset.
Virus Filtering Enabled
If selected (a checkbox is checked), virus scans are performed on incoming emails. All emails detected by the filter containing viruses or malware are automatically deleted. Note that the user is not notified of the deletion.
Spam Filtering Enabled
If selected, spam filtering (spam = spam) is performed on incoming emails. The precise settings for spam filtering are defined by a threshold and rejection threshold, which are given certain values.
Note: When spam filtering is disabled, no blacklist checks are performed. However, advanced filtering settings (if any) remain active.
Spam Score Assignment
The threshold value can be set to “do not mark”, which means the filter will not add supplementary header information to the email message, even if it is detected as spam. Header information is added if the value is set to 1-9, the email is detected as spam, and the threshold is set low enough to mark the spam message compared to a spam message’s score. The filter assigns a spam score to the message based on the words contained within it.
The values on the menu range from 1 (lowest score) to 9 (highest score).
If spam filtering is not enabled, no marking is performed on spam emails, even if the rejection threshold is set to any value between 1-9.
When the threshold is exceeded, the following header information is added to the email message:
This header information can be used, for example, in email programs (Thunderbird, Outlook, etc.), where you can set your own filters to examine the header information and determine what to do with the email – move it to the Junk folder, for example.
Spam Score Removal
The rejection threshold can be set to “do not reject”, which means the filter will never reject a message, even if it is detected as spam and the marking threshold has also been exceeded. If the value is set to 1-9, the email is detected as spam and the rejection threshold is exceeded compared to a spam message’s score, the server will reject the email reception. The sender will typically receive a message indicating that the message did not arrive.
The value on the menu ranges from 1 (lowest score) to 9 (highest score).
Note: Values 1-2 should not be used, as the filter may then reject legitimate messages (in error). Testing first is always recommended!
If spam filtering is not enabled, no spam emails are rejected, even if the rejection threshold is set to any value between 1-9.
Advanced Filtering Settings
Advanced filtering settings allow you to define more detailed rules for what to do when an email arrives. You can reject, accept, or move the email to a different folder (defaulting to the “Inbox/Saapuneet” folder).
Example “Whitelist”: All emails from the domain “meikalainen.fi” are accepted.
Select Advanced Filtering Settings to open.
Press the Add Rule button.
From the dropdown menu Sender Domain, select “Domain”, from the Operator dropdown menu select “Contains”, and enter the value in the Value field: “meikalainen.fi”.
Select the Action field to “Accept”.
Press the Add Rule button.
Remember to save, i.e., press the Confirm button and then the Save button after you have made changes.
Public Black Lists
Black lists (DNSBL or DNS blacklists) are used to assist in filtering. They contain lists of IP addresses or domain names that have been linked to spam, malware distribution, or other suspicious activity. When an email server receives an incoming email, it checks the sender’s information against the available black lists and decides based on them whether to reject the message.
Selecting Global Black Lists opens the selection of a specific black lists. Remember to always save, i.e., press the Confirm button and then the Save button, when you have made changes.
Additionally, users can create their own rules for spam filtering within their own email program (client-side filtering). Users should refer to their email program’s own documentation for details.
Changing Settings (Server-Side Filtering)
An administrator (admin) can modify settings for all email accounts on the customer pages. The customer pages list all email addresses for a domain: email accounts and email aliases under the Settings -> Email section. Clicking the “Edit” button for a specific email account allows you to change account-specific settings.
A mailbox user can modify their own email account’s filtering settings (without needing to log in as an administrator on the customer pages) at https://webmail.avaruus.net/asetukset.
Virus Filtering Enabled
If selected (a checkbox is checked), virus scans are performed on incoming emails. All emails detected by the filter containing viruses or malware are automatically deleted. Note that the user is not notified of the deletion.
Spam Filtering Enabled
If selected, spam filtering (spam = spam) is performed on incoming emails. The precise settings for spam filtering are defined by a threshold and rejection threshold, which are given certain values.
Note: When spam filtering is disabled, no blacklist checks are performed. However, advanced filtering settings (if any) remain active.
Spam Score Assignment
The threshold value can be set to “do not mark”, which means the filter will not add supplementary header information to the email message, even if it is detected as spam. Header information is added if the value is set to 1-9, the email is detected as spam, and the threshold is set low enough to mark the spam message compared to a spam message’s score. The filter assigns a spam score to the message based on the words contained within it.
The values on the menu range from 1 (lowest score) to 9 (highest score).
If spam filtering is not enabled, no marking is performed on spam emails, even if the rejection threshold is set to any value between 1-9.
When the threshold is exceeded, the following header information is added to the email message:
X-Spam-Score: (spam score)
X-Spam-Flag: YESThis header information can be used, for example, in email programs (Thunderbird, Outlook, etc.), where you can set your own filters to examine the header information and determine what to do with the email – move it to the Junk folder, for example.
Spam Score Removal
The rejection threshold can be set to “do not reject”, which means the filter will never reject a message, even if it is detected as spam and the marking threshold has also been exceeded. If the value is set to 1-9, the email is detected as spam and the rejection threshold is exceeded compared to a spam message’s score, the server will reject the email reception. The sender will typically receive a message indicating that the message did not arrive.
The value on the menu ranges from 1 (lowest score) to 9 (highest score).
Note: Values 1-2 should not be used, as the filter may then reject legitimate messages (in error). Testing first is always recommended!
If spam filtering is not enabled, no spam emails are rejected, even if the rejection threshold is set to any value between 1-9.
Advanced Filtering Settings
Advanced filtering settings allow you to define more detailed rules for what to do when an email arrives. You can reject, accept, or move the email to a different folder (defaulting to the “Inbox/Saapuneet” folder).
Example “Whitelist”: All emails from the domain “meikalainen.fi” are accepted.
Select Advanced Filtering Settings to open.
Press the Add Rule button.
From the dropdown menu Sender Domain, select “Domain”, from the Operator dropdown menu select “Contains”, and enter the value in the Value field: “meikalainen.fi”.
Select the Action field to “Accept”.
Press the Add Rule button.
Remember to save, i.e., press the Confirm button and then the Save button after you have made changes.
Public Black Lists
Black lists (DNSBL or DNS blacklists) are used to assist in filtering. They contain lists of IP addresses or domain names that have been linked to spam, malware distribution, or other suspicious activity. When an email server receives an incoming email, it checks the sender’s information against the available black lists and decides based on them whether to reject the message.
Selecting Global Black Lists opens the selection of a specific black lists. Remember to always save, i.e., press the Confirm button and then the Save button, when you have made changes.
Updated on: 12/06/2025
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