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RFC2822 defines the following Address Specification types:

address         =       mailbox / group

mailbox         =       name-addr / addr-spec

name-addr       =       [display-name] angle-addr

angle-addr      =       [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr

group           =       display-name ":" [mailbox-list / CFWS] ";"
                        [CFWS]

display-name    =       phrase

mailbox-list    =       (mailbox *("," mailbox)) / obs-mbox-list

address-list    =       (address *("," address)) / obs-addr-list

I've gone over the spec several times and can find no functional or actual difference between the mailbox-list and the address-list. What is the difference?

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vy32
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1 Answers1

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The difference is an "address" can be a "group". A group might be:

undisclosed-recipients: ;

for example (as seen on Bcc's, for example).

John Hascall
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