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FairEmail
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Set resent headers correctly

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pull/194/merge
M66B 3 years ago
parent 20dffe0ea2
commit 50d8bbc59d
3 changed files with 95 additions and 49 deletions
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2
FAQ.md
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@ -3407,7 +3407,7 @@ Remarks:
* The original subject is sent as-is, unless it is being changed
* The original message text will be sent as-is, unless text is being entered
* The original attachments are sent as they are, unless attachments are being added or removed
* Default CC and BCC addresses will be applied
* Default CC and BCC addresses will not be applied
* Read and delivery receipts will be requested when enabled, they could go to the original sender or to you
* The email server might refused resent messages
* DKIM, SPF and DMARC will likely fail, often causing resent messages to be considered as spam

113
app/src/main/java/eu/faircode/email/MessageHelper.java
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@ -281,75 +281,96 @@ public class MessageHelper {
MailDateFormat mdf = new MailDateFormat();
mdf.setTimeZone(hide_timezone ? TimeZone.getTimeZone("UTC") : TimeZone.getDefault());
String date = mdf.format(new Date(message.sent == null ? message.received : message.sent));
imessage.setHeader("Date", date);
String ourDate = mdf.format(new Date(message.sent == null ? message.received : message.sent));
Address us = null;
if (message.from != null && message.from.length > 0) {
us = getFrom(message, identity);
imessage.setFrom(us);
}
Address ourFrom = null;
if (message.from != null && message.from.length > 0)
ourFrom = getFrom(message, identity);
// Resend
if (message.headers != null) {
// https://datatracker.ietf.org/doc/html/rfc2822#section-3.6.6
if (us != null)
imessage.addHeader("Resent-From", us.toString());
if (message.headers == null) {
imessage.setHeader("Date", ourDate);
imessage.addHeader("Resent-Date", date);
// Addresses
if (ourFrom != null)
imessage.setFrom(ourFrom);
if (message.to != null && message.to.length > 0)
imessage.setRecipients(Message.RecipientType.TO, convertAddress(message.to, identity));
if (message.cc != null && message.cc.length > 0)
imessage.setRecipients(Message.RecipientType.CC, convertAddress(message.cc, identity));
if (message.bcc != null && message.bcc.length > 0)
imessage.setRecipients(Message.RecipientType.BCC, convertAddress(message.bcc, identity));
} else {
// https://datatracker.ietf.org/doc/html/rfc2822#section-3.6.6
ByteArrayInputStream bis = new ByteArrayInputStream(message.headers.getBytes());
List<Header> headers = Collections.list(new InternetHeaders(bis).getAllHeaders());
for (Header header : headers) {
String name = header.getName();
String value = header.getValue();
if (name == null || value == null)
if (name == null || TextUtils.isEmpty(value))
continue;
switch (name.toLowerCase(Locale.ROOT)) {
case "from":
// Override default header
imessage.setFrom(value);
break;
case "date":
// Override default header
imessage.setHeader("Date", value);
break;
case "from":
imessage.setFrom(value);
break;
case "to":
imessage.addHeader("Resent-To", value);
imessage.setRecipients(Message.RecipientType.TO, InternetAddress.parse(value));
break;
case "cc":
imessage.addHeader("Resent-Cc", value);
imessage.setRecipients(Message.RecipientType.CC, InternetAddress.parse(value));
break;
case "bcc":
imessage.addHeader("Resent-Bcc", value);
imessage.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(value));
break;
case "reply-to":
imessage.setReplyTo(InternetAddress.parse(value));
break;
// Resent-Sender
// Resent-Message-ID
}
}
// The "Resent-Date:" indicates the date and time at which the resent
// message is dispatched by the resender of the message.
imessage.addHeader("Resent-Date", ourDate);
// a simple "Resent-From:" form which
// contains the mailbox of the individual doing the resending
if (ourFrom != null)
imessage.addHeader("Resent-From", ourFrom.toString());
// The "Resent-To:", "Resent-Cc:", and "Resent-Bcc:" fields function
// identically to the "To:", "Cc:", and "Bcc:" fields respectively,
// except that they indicate the recipients of the resent message, not
// the recipients of the original message.
if (message.to != null && message.to.length > 0)
imessage.addHeader("Resent-To", InternetAddress.toString(message.to));
if (message.cc != null && message.cc.length > 0)
imessage.addHeader("Resent-Cc", InternetAddress.toString(message.cc));
if (message.bcc != null && message.bcc.length > 0)
imessage.addHeader("Resent-Bcc", InternetAddress.toString(message.bcc));
// Each new set of resent fields is prepended to the message;
// that is, the most recent set of resent fields appear earlier in the message.
for (Header header : headers) {
String name = header.getName();
String value = header.getValue();
if (name == null || value == null)
if (name == null || TextUtils.isEmpty(value))
continue;
if (name.toLowerCase(Locale.ROOT).startsWith("resent-"))
imessage.addHeader(name, value);
}
}
// Addresses
if (message.to != null && message.to.length > 0)
imessage.setRecipients(Message.RecipientType.TO, convertAddress(message.to, identity));
if (message.cc != null && message.cc.length > 0)
imessage.setRecipients(Message.RecipientType.CC, convertAddress(message.cc, identity));
if (message.bcc != null && message.bcc.length > 0)
imessage.setRecipients(Message.RecipientType.BCC, convertAddress(message.bcc, identity));
if (message.subject != null) {
int maxlen = MAX_HEADER_LENGTH - "Subject: ".length();
if (message.subject.length() > maxlen)
@ -359,17 +380,19 @@ public class MessageHelper {
// Send message
if (identity != null) {
// Add reply to
if (message.headers == null && identity.replyto != null)
imessage.setReplyTo(convertAddress(InternetAddress.parse(identity.replyto), identity));
// Add extra cc
if (identity.cc != null)
addAddress(identity.cc, Message.RecipientType.CC, imessage, identity);
// Add extra bcc
if (identity.bcc != null)
addAddress(identity.bcc, Message.RecipientType.BCC, imessage, identity);
if (message.headers == null) {
// Add reply to
if (identity.replyto != null)
imessage.setReplyTo(convertAddress(InternetAddress.parse(identity.replyto), identity));
// Add extra cc
if (identity.cc != null)
addAddress(identity.cc, Message.RecipientType.CC, imessage, identity);
// Add extra bcc
if (identity.bcc != null)
addAddress(identity.bcc, Message.RecipientType.BCC, imessage, identity);
}
// Delivery/read request
if (message.receipt_request != null && message.receipt_request) {

29
app/src/main/java/eu/faircode/email/ServiceSend.java
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@ -48,6 +48,8 @@ import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
@ -681,9 +683,30 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
if (ident.max_size == null)
max_size = iservice.getMaxSize();
Address[] to = imessage.getAllRecipients();
List<Address> recipients = new ArrayList<>();
if (message.headers == null) {
Address[] all = imessage.getAllRecipients();
if (all != null)
recipients.addAll(Arrays.asList(all));
} else {
String to = imessage.getHeader("Resent-To", ",");
if (to != null)
for (Address a : InternetAddress.parse(to))
recipients.add(a);
String cc = imessage.getHeader("Resent-Cc", ",");
if (cc != null)
for (Address a : InternetAddress.parse(cc))
recipients.add(a);
String bcc = imessage.getHeader("Resent-Bcc", ",");
if (bcc != null)
for (Address a : InternetAddress.parse(bcc))
recipients.add(a);
}
String via = "via " + ident.host + "/" + ident.user +
" to " + (to == null ? null : TextUtils.join(", ", to));
" recipients=" + TextUtils.join(", ", recipients);
iservice.setReporter(new TraceOutputStream.IReport() {
private int progress = -1;
@ -707,7 +730,7 @@ public class ServiceSend extends ServiceBase implements SharedPreferences.OnShar
// Send message
EntityLog.log(this, "Sending " + via);
start = new Date().getTime();
iservice.getTransport().sendMessage(imessage, to);
iservice.getTransport().sendMessage(imessage, recipients.toArray(new Address[0]));
end = new Date().getTime();
EntityLog.log(this, "Sent " + via + " elapse=" + (end - start) + " ms");
} catch (MessagingException ex) {

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