![[MU Poststamp]](/graphics/mustamp.png)
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GNU Mailutils |
General-Purpose Mail Package |
Official GNU Software |
| GNU Mailutils Manual (split by node): |  |
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Wherever the mail is and whatever format it is stored in, it is operated upon using the same set of functions. To unified the C API, GNU Mailutils offers a heteroclite set of objects that work in aggregation to do operations on emails. Each object does a specific task and delegates non-related tasks to others. The object comes alive by specifying a URL parameter when created, it will indicate the storage format or protocol (POP3, IMAP4, MH, MAILDIR, etc ..).
mu_folder_t mu_url_t
-/var/mail- +- .. ->+-------------------+ +-->+------------+
( alain *-)-+ | | mu_url_t *-|---+ | port |
---------- | | |-------------------| | hostname |
( jakob *-)-+--+ | mu_auth_t *-|---+ | file |
---------- | |-------------------| | | ... |
( jeff *-)-+ | mu_stream_t | | +------------+
---------- | |-------------------| |
( shaleh*-)-+ | ..... | | mu_auth_t
---------- |-------------------| +-->+-------------+
+---|-* mu_mailbox_t[] | | mu_ticket_t |
mu_mailbox_t | +-------------------+ +-------------+
+-------------------+
| mu_locker_t *--|-------------+
|-------------------| |
| mu_url_t | | mu_locker_t
|-------------------| +-------->+---------+
| mu_stream_t | | lock |
|-------------------| | unlock |
| mu_message_t[] *-|-------+ +---------+
+-------------------+ | mu_envelope_t
| +-------->+-----------+
mu_message_t | | | date |
+-------------------+<------+ | | from |
| mu_envelope_t *-|------------------+ | to |
|-------------------| mu_header_t +-----------+
| mu_header_t *-|------------>+-----------------+
|-------------------| | mu_stream_t |
| mu_body_t *-|----+ +-----------------+
+-------------------+ | mu_body_t
+-->+-----------------+
| mu_stream_t |
+-----------------+
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As an example, here is a simplified version of from command. It
lists the ‘From’ and ‘Subject’ headers of every mail in a mailbox.
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <mailutils/mailutils.h>
int
main (int argc, const char **argv)
{
char *from;
char *subject;
mu_mailbox_t mbox;
size_t msgno, total = 0;
int status;
/* Register the formats. */
mu_register_all_mbox_formats ();
status = mu_mailbox_create_default (&mbox, argv[1]);
if (status != 0)
{
mu_error ("mu_mailbox_create: %s", mu_strerror (status));
exit (EXIT_FAILURE);
}
status = mu_mailbox_open (mbox, MU_STREAM_READ);
if (status != 0)
{
mu_error ("mu_mailbox_open: %s", mu_strerror (status));
exit (EXIT_FAILURE);
}
mu_mailbox_messages_count (mbox, &total);
for (msgno = 1; msgno <= total; msgno++)
{
mu_message_t msg;
mu_header_t hdr;
if ((status = mu_mailbox_get_message (mbox, msgno, &msg)) != 0
|| (status = mu_message_get_header (msg, &hdr)) != 0)
{
mu_error ("Error message: %s", mu_strerror (status));
exit (EXIT_FAILURE);
}
if (mu_header_aget_value (hdr, MU_HEADER_FROM, &from))
from = strdup ("(NO FROM)");
if (mu_header_aget_value (hdr, MU_HEADER_SUBJECT, &subject))
subject = strdup ("(NO SUBJECT)");
printf ("%s\t%s\n", from, subject);
free (from);
free (subject);
}
status = mu_mailbox_close (mbox);
if (status != 0)
{
mu_error ("mu_mailbox_close: %s", mu_strerror (status));
exit (EXIT_FAILURE);
}
mu_mailbox_destroy (&mbox);
return 0;
}
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Here is a sample output produced by this program:
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| GNU Mailutils Manual (split by node): | |
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