Spam Filtering

Apr 29, 2019 | Support

Just like every other email provider, Lexicom has implemented spam or junk email filtering. By default, it is enabled and set up to store anything the filter thinks is spam or junk in a folder called “spam” on the server which you can access using IMAP or through webmail. Anything stored in the “spam” folder will be removed automatically after a few weeks.

You can turn the filter on or off for individual email addresses in your account settings or via webmail. You can also set it to simply delete anything it identifies as spam without bothering to save it to the “spam” folder. You can also set it to add a tag to the subject line instead of saving it to the “spam” folder. However, we recommend leaving it on the default setting since that gives the best results in most cases.

Our filtering solution uses SpamAssassin as the primary filtering tool. We also use Spamhaus’s block list as an input into the filter to improve rejection rates.

There are also a few ad hoc filters based on specific spam instances we have seen. These are combined with a few customized SpamAssassin rules that seem to have improved the catch rate.

We used to use more things as filter inputs, but they tended to cause more trouble than they solved. Most notably, they tended to cause significantly increased false positive rates (which is where a message is incorrectly identified as spam).

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