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services:e-mail_service:antispam_filters [2016/10/28 12:27] zanello [Barracuda Spam Firewall] |
services:e-mail_service:antispam_filters [2019/07/22 15:01] giunta [Blocked Notifications for Received E-mail] |
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In the last years the SPAM phenomenon (Unsolicited Bulk & Commercial E-mails) has grown exponentially. Today the SPAM is over the 50% of the total e-mail traffic. In order not to waste time discarding UCE and IBE e-mails, complex filters are required for the incoming e-mail traffic. **SISSA has two filters for the incoming e-mails**. | In the last years the SPAM phenomenon (Unsolicited Bulk & Commercial E-mails) has grown exponentially. Today the SPAM is over the 50% of the total e-mail traffic. In order not to waste time discarding UCE and IBE e-mails, complex filters are required for the incoming e-mail traffic. **SISSA has two filters for the incoming e-mails**. | ||
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==== SafeMail ===== | ==== SafeMail ===== | ||
- | **The first filter for the incoming e-mail is SafeMail, a commercial product of Spin** (http://www.spin.it). This software is installed on the incoming e-mail gateway server. This machine is named hermes.sissa.it that is also the Mail Exchanger (MX) for the domain sissa.it. This filter **is applied by default to all the incoming mail** for the domains sissa.it and democritos.it. | + | **The first filter for the incoming e-mail is SafeMail, a commercial product of Spin** (http://www.spin.it). This software is installed on the incoming e-mail gateway server. This machine is the Mail Exchanger (MX) for the domain sissa.it. This filter **is applied by default to all the incoming mail** for the domains sissa.it. |
This software use some RBLs (Real-time Spam Black Lists) to reject SPAM. | This software use some RBLs (Real-time Spam Black Lists) to reject SPAM. | ||
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More information about Spin SafeMail are available at address http://www.spin.it/spam/#eng. | More information about Spin SafeMail are available at address http://www.spin.it/spam/#eng. | ||
- | Real-time statistics about SafeMail filter are available on the web page (available only inside SISSA network): http://hermes.sissa.it/cgi-bin/spamstats | ||
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- | ==== Barracuda Spam Firewall ==== | ||
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- | **The second filter is Barracuda Spam Firewall**, a commercial appliance (special hardware with customized software), produced by [[http://www.barracudanetworks.com/|BarracudaNetworks]]. This machine operate with several anti-spam filters (DNSBL filters, euristhics filters, bayesian database, etc.). | ||
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- | ** At every incoming mail is assigned a spam score value**. Higher values are feature of SPAM e-mails. | ||
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- | **Only the e-mails** tagged definitively as Spam (**spam score over 9 points) are blocked by the Barracuda Spam Firewall**. \\ | ||
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- | The others --allowed or tagged as probably spam-- are delivered to the final user. | ||
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- | The score may be negative o zero when the message is classified as not-spam. Values higher than 3.5 means that the mail is probably a SPAM message. The score should be used by an automatic procedure to separate the legitimate e-mails from the SPAM. \\ | ||
- | For more information and to manage your Spam level, please read [[services:e-mail_service:webmailfaq:start|WEBMAIL interfaces FAQ]]. | ||
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- | Real-time statistics about Barracuda filtering are available on the web page: http://spam-stats.sissa.it/ (only internal). \\ | ||
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===== Anti-Virus Filters ===== | ===== Anti-Virus Filters ===== | ||
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- | ==== Blocked Notifications for Received E-mail ==== | ||
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- | When our mail server finds banned content in an e-mail destined to your e-mail address, it will send you an e-mail. | ||
- | This is example, where: | ||
- | * //your_username@sissa.it// is your e-mail address. | ||
- | * //sender@example.com// is the e-mail address of the sender (may be empty in case of spam). | ||
- | * //filename// is the name (or only the extension ) of the banned file. | ||
- | <code> | ||
- | From: SISSA SISSA Barracuda Spam Firewall <postmaster@sissa.it> | ||
- | To: your_username@sissa.it | ||
- | Subject: BANNED FILE IN MAIL TO YOU (from <sender@example.com>) / | ||
- | FILE BLOCCATO IN UNA MAIL DIRETTA A TE ( spedita da <sender@example.com>) | ||
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- | BANNED FILENAME ALERT | ||
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- | The SISSA Spam Firewall (charon.sissa.it) found an attached | ||
- | file 'filename' in an e-mail sent from <sender@example.com>. | ||
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- | Due to security reason, our system has been set to block this type of file. | ||
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- | For further information, visit: | ||
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- | http://www.itcs.sissa.it/services/e-mail_service/antispam_filters#anti-virus_filters | ||
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- | ------------------------- | ||
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- | AVVISO FILE BLOCCATO | ||
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- | L'anti-spam della SISSA (charon.sissa.it) ha trovato un file 'filename' | ||
- | allegato ad una mail inviata da <sender@example.com>. | ||
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- | Per motivi di sicurezza, il nostro sistema ha bloccato questo tipo di file. | ||
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- | Per ulteriori informazioni, visita: | ||
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- | http://www.itcs.sissa.it/services/e-mail_service/antispam_filters#anti-virus_filters | ||
- | </code> | ||