Table 1 Inclusion/exclusion criteria

Minimum age of 18 years old

Presence of serious psychiatric comorbidities (substance dependence, bipolar affective disorder, obsessive compulsive disorder, psychotic illness)

Meeting the DSM-IV diagnostic criteria for Major Depressive Disorder

High risk for suicide

Ability to understand and read Spanish

Receiving psychological treatment for depression at the time of recruitment

Access to Internet and having an email address

An increase and/or change in the pharmacological treatment (in the case of receiving it) during the study period

Providing written informed consent

Medical disease that prevents the participant from carrying out the psychological treatment