Question: which type of email server is typically used for outgoing mail
[{'answer': 'TCP port 25', 'provenance': [{'wikipedia_id': '27675', 'title': 'Simple Mail Transfer Protocol', 'start_paragraph_id': 47, 'start_character': 63, 'end_paragraph_id': 47, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Outgoing mail SMTP server.:Ports.\n'}]}]