COVID-19: As a designated essential telecom solutions provider, EXFO remains fully operational with our employees' health and safety as our top priority.

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Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business.

Simple Mail Transfer Protocol (SMTP)

An Internet standard for electronic mail transmission across IP networks. SMTP was first defined by RFC 821 and last updated by RFC 5321, which includes the extended SMTP (ESMTP) additions.

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