diff options
Diffstat (limited to 'driver.c')
| -rw-r--r-- | driver.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -528,6 +528,29 @@ static int readheaders(int sock, has_nuls = (linelen != strlen(line)); /* + * When mail delivered to a multidrop mailbox on the server is + * addressed to multiple people, there will be one copy left + * in the box for each recipient. Thus, if the mail is addressed + * to N people, each recipient would get N copies. + * + * Foil this by suppressing all but one copy of a message with + * a given Message-ID. Note: This implementation only catches + * runs of successive identical messages, but that should be + * good enough. + */ + if (MULTIDROP(ctl) && !strncasecmp(line, "Message-ID:", 11)) + { + if (ctl->lastid && !strcasecmp(ctl->lastid, line)) + return(PS_REFUSED); + else + { + if (ctl->lastid) + free(ctl->lastid); + ctl->lastid = strdup(line); + } + } + + /* * The University of Washington IMAP server (the reference * implementation of IMAP4 written by Mark Crispin) relies * on being able to keep base-UID information in a special |