…) Either Model 1 (IETF) or Model 2 (FCFS) as described in Sections 8.1.1.1 of [ RFC-ietf-emailcore-rfc5321bis-43 ]. Reference RFC-ietf-emailcore-rfc5321bis-43, Sections 8.1.1, 2.2.2 Note The Simple Mail Transfer Protocol [ RFC-ietf-emailcore-rfc5321bis-43 specifies a set of comma…

…) Either Model 1 (IETF) or Model 2 (FCFS) as described in Sections 8.1.1.1 of [ RFC-ietf-emailcore-rfc5321bis-43 ]. Reference RFC-ietf-emailcore-rfc5321bis-43, Sections 8.1.1, 2.2.2 Note The Simple Mail Transfer Protocol [ RFC-ietf-emailcore-rfc5321bis-43 specifies a set of comma…