Field network testing
Lab and manufacturing testing
Service assurance platform
Adaptive service assurance solutions
Communications service providers
Academic and research institutions
Cable MSO (multiple system operator)
Network equipment manufacturers
Webscale companies and data centers
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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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