message/CPIM 'IANA,RFC3862
message/delivery-status 'IANA,RFC1894
message/disposition-notification 'IANA,RFC3798
message/example 'IANA,RFC4735
message/external-body :8bit 'IANA,RFC2045,RFC2046
message/feedback-report 'IANA,RFC5965
message/global 'IANA,RFC6532
message/global-delivery-status 'IANA,RFC6533
message/global-disposition-notification 'IANA,RFC6533
message/global-headers 'IANA,RFC6533
message/http 'IANA,RFC2616
message/imdn+xml 'IANA,RFC5438
message/partial :8bit 'IANA,RFC2045,RFC2046
message/rfc822 @eml :8bit 'IANA,RFC2045,RFC2046
message/s-http 'IANA,RFC2660
message/sip 'IANA,RFC3261
message/sipfrag 'IANA,RFC3420
message/tracking-status 'IANA,RFC3886
