UIDL Max Size? (for POP3)

Question:
I’m trying to find out the maximum size of the POP3 UIDL.
I’ve found various POP3 specs, but they dont list field sizes.
Do you know the max size or can you give me any links to this info?

Answer:
(from RFC 1939) The unique-id of a message is an arbitrary server-determined
string, consisting of one to 70 characters in the range 0x21
to 0x7E, which uniquely identifies a message within a
maildrop and which persists across sessions. This
persistence is required even if a session ends without
entering the UPDATE state. The server should never reuse an
unique-id in a given maildrop, for as long as the entity
using the unique-id exists.

IMPORTANT: It has been found that some servers produce longer UIDLs than the max indicated by the POP3 RFC specification. If using a database field to store the UIDL, it’s best to make it 255 chars.