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e7699708ef
in smtpserver, we store dmarc evaluations (under the right conditions). in dmarcdb, we periodically (hourly) send dmarc reports if there are evaluations. for failed deliveries, we deliver the dsn quietly to a submailbox of the postmaster mailbox. this is on by default, but can be disabled in mox.conf.
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
package smtpserver
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import (
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"context"
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"fmt"
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"os"
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"github.com/mjl-/mox/dsn"
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"github.com/mjl-/mox/mlog"
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"github.com/mjl-/mox/queue"
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"github.com/mjl-/mox/smtp"
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"github.com/mjl-/mox/store"
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)
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// compose dsn message and add it to the queue for delivery to rcptTo.
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func queueDSN(ctx context.Context, c *conn, rcptTo smtp.Path, m dsn.Message, requireTLS bool) error {
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buf, err := m.Compose(c.log, false)
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if err != nil {
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return err
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}
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var bufUTF8 []byte
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if c.smtputf8 {
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bufUTF8, err = m.Compose(c.log, true)
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if err != nil {
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c.log.Errorx("composing dsn with utf-8 for incoming delivery for unknown user, continuing with ascii-only dsn", err)
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}
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}
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f, err := store.CreateMessageTemp("smtp-dsn")
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if err != nil {
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return fmt.Errorf("creating temp file: %w", err)
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}
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defer func() {
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name := f.Name()
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err = f.Close()
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c.log.Check(err, "closing temporary dsn message file")
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err := os.Remove(name)
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c.log.Check(err, "removing temporary dsn message file", mlog.Field("path", name))
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}()
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if _, err := f.Write([]byte(buf)); err != nil {
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return fmt.Errorf("writing dsn file: %w", err)
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}
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// Queue DSN with null reverse path so failures to deliver will eventually drop the
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// message instead of causing delivery loops.
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// ../rfc/3464:433
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const has8bit = false
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const smtputf8 = false
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var reqTLS *bool
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if requireTLS {
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reqTLS = &requireTLS
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}
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qm := queue.MakeMsg("", smtp.Path{}, rcptTo, has8bit, smtputf8, int64(len(buf)), m.MessageID, nil, reqTLS)
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qm.DSNUTF8 = bufUTF8
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if err := queue.Add(ctx, c.log, &qm, f); err != nil {
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return err
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}
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return nil
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}
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