outlook - Do all email clients use "In-Reply-To" field in email header? -


when email send message-id header, replies include in-reply-to naming id , references can name list of parent message id's, , email clients use information construct threads when viewing list of emails in threaded view.

my question is: email clients (outlook, gmail, exchange, etc) append in-reply-to field in email header while sending reply existing email?

i referred rfc 2822 says in-reply-to field optional.

though optional, every message should have "message-id:" field. furthermore, reply messages should have "in-reply-to:"

example of in-reply-to email header:

first email:

message-id <foobar-1234-0@server.com> in-reply-to: not provided references: not provided

second email:

message-id <foobar-1234-1@server.com> in-reply-to: <foobar-1234-0@server.com> references: <foobar-1234-0@server.com>

third email:

message-id <foobar-1234-2@server.com> in-reply-to: <foobar-1234-1@server.com> references: <foobar-1234-0@server.com> <foobar-1234-1@server.com>


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