A computer-implemented method for filtering electronic messages. The method may include identifying a first time period during which a user accesses electronic messages less than during a second time period. The method may also include associating a first filtering level with the first time period and associating a second filtering level with a second time period. The method may further include, during the first time period, setting a spam filter to the first filtering level. The first filtering level may cause the spam filter to perform stronger filtering than the second filtering level. The method may include, during the second time period, setting the spam filter to the second filtering level. Corresponding systems and computer-readable media are also disclosed.