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According to the text, in order to avoid spoofing, one should

Ano: 2015
Banca: Fundação para o Vestibular da Universidade Estadual Paulista - VUNESP
Prova: VUNESP - TCE SP - Auxiliar da Fiscalização Financeira II - Área Informática - 2015
According to the text, in order to avoid spoofing, one should
A
discontinue the SMTP as the main mail protocol.
B
be careful to include a security level with the mail server.
C
exclude all suspect senders from your contact list.
D
withdraw sensitive data from mails.
E
check the authenticity of self-sending mails.