Instituto Superior Técnico

Serviços de Informática

What limits do I have on the number of emails I can send?

Currently, each user can send e-mails to a maximum of 500 recipients per day using their e-mail account. In addition, there is a restriction that imposes a limit of 200 e-mails per 5 minutes and 450 e-mails per hour.

These limits were motivated by the enormous difficulty in combating SPAM (unsolicited and undesirable mail). For the IST not to be affected as a whole, these restrictions are necessary to ensure a good e-mail service is provided.

If you want to send mass e-mails to more recipients, contact us via e-mail: