> On Apr 28, 2021, at 12:28 PM, Asai <a...@globalchangemusic.org> wrote:
>
> We are getting reports, more and more, of email clients (Type App, Mac Mail,
> iOS Mail) that seem to send email, and show that the email has been sent on
> the client, but the mail server has no record of email ever reaching the SMTP
> service, nor does it even seem that the client is connecting to the server.
>
> Can someone advise as to what area of debugging we can turn on? There's a lot
> of info in debugging, and we can't turn it all on at once, so we could use
> some specifics.
The only *debugging* that makes sense in this context is to obtain a copy of the
delivered message:
- The sender should Cc or Bcc a copy of a test message to both the intended
recipient and to you (or another administrator of the submission service).
- The "Received" headers should show the various hops that the message went
through.
- If the intended recipient also receives a copy, and can forward it to you
with all headers, that'd be great too.
If nobody receives the message, and your Postfix server shows no connection
attempts from the clients, then the problem is not your Postfix server.
(This assumes you have working logging, i.e. not broken by systemd-journald
or similar brain damage).
--
Viktor.
