Lucas RayanandClaude Opus 5
caec501ec5
Encontrado a correr o script guardado na caixa real antes de o pôr no ar. O Google envia os relatórios DMARC de noreply-dmarc-support@google.com, e a verificação só reconhecia a palavra exacta ou um sufixo com "+": a caixa teria respondido automaticamente a todos os relatórios diários que recebe. O prefixo passa a ser comparado com os separadores que os remetentes usam de facto - "+", "-", "." e "_" - e a lista cresce com os nomes correntes deste tipo de endereço. Continua a responder a uma pessoa cujo endereço apenas começa por uma dessas palavras, o que também tem teste: "bouncer" é gente, "bounces-123" não é. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
76 lines
2.4 KiB
Go
76 lines
2.4 KiB
Go
package sieve
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import "strings"
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// shouldAutoReply decides whether a message may be answered automatically.
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//
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// This is the part of a vacation responder that matters. Replying to the wrong
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// thing is how a mailbox answers a mailing list in front of everyone, or ends
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// up in a loop with another autoresponder that replies to the reply. RFC 3834
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// is the rule: answer a message a person actually sent, and nothing else.
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func shouldAutoReply(msg Message) bool {
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// An empty envelope sender is a bounce or a notification. Replying to one
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// sends mail to nobody, or worse, back into a loop.
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if strings.TrimSpace(msg.Sender) == "" {
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return false
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}
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// Never answer yourself: the Sent copy and any self-addressed message.
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if msg.Recipient != "" && strings.EqualFold(msg.Sender, msg.Recipient) {
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return false
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}
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local := strings.ToLower(msg.Sender)
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if at := strings.Index(local, "@"); at > 0 {
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local = local[:at]
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}
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// Addresses that exist to carry automated mail. Answering one is at best
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// noise and at worst a loop.
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//
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// The prefix is matched against every separator a real sender uses, not
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// just "+". Google sends its DMARC reports from
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// noreply-dmarc-support@google.com: checking only for the exact word or a
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// "+" suffix let that through, and this mailbox would have auto-replied to
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// every daily report it receives.
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for _, reserved := range []string{
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"mailer-daemon", "mailerdaemon", "postmaster", "no-reply", "noreply",
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"donotreply", "do-not-reply", "bounce", "bounces", "notification",
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"notifications", "automated", "auto-reply", "autoreply",
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} {
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if local == reserved {
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return false
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}
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for _, separator := range []string{"+", "-", ".", "_"} {
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if strings.HasPrefix(local, reserved+separator) {
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return false
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}
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}
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}
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// Headers that say, in one way or another, "this was not typed by a
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// person" or "do not answer this".
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if len(msg.header("auto-submitted")) > 0 {
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for _, v := range msg.header("auto-submitted") {
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if !strings.EqualFold(strings.TrimSpace(v), "no") {
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return false
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}
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}
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}
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for _, header := range []string{
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"list-id", "list-help", "list-unsubscribe", "list-post",
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"x-auto-response-suppress", "x-autoreply", "x-autorespond",
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} {
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if len(msg.header(header)) > 0 {
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return false
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}
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}
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for _, v := range msg.header("precedence") {
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switch strings.ToLower(strings.TrimSpace(v)) {
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case "bulk", "list", "junk":
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return false
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}
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}
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return true
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}
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