thread

As for search(), but returns message sequence numbers in threaded format, as a Net::IMAP::ThreadMember tree. The supported algorithms are:

ORDEREDSUBJECT

split into single-level threads according to subject, ordered by date.

REFERENCES

split into threads by parent/child relationships determined by which message is a reply to which.

Unlike search(), charset is a required argument. US-ASCII and UTF-8 are sample values.

See [SORT-THREAD-EXT] for more details.