On Tue, 2011-11-22 at 00:47 +0300, Alexander Chekalin wrote: > > With Maildir the message GUID is typically the same as the Maildir base > > filename (i.e. everything before ':' character). > > But what if I one day decide to convert my maildir's to mbox'es? > I really plan to do such conversion in a while (as soon as I finish the > indexing system).
mbox? or mdbox? With mbox there are no proper GUIDs, but Dovecot kind of fakes it by returning MD5 of specific headers as GUIDs (so not 100% reliable). With mdbox GUIDs work even better than with Maildir, the GUID is always stored in the message's metadata.