On 28 Apr 2021, at 10:28, 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.

First guess is they are sending through a different server. Mac/iOS are pretty 
good about trying over servers if one fails.

> 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.

If you do not see them connecting to you, no amount of logging or debugging 
will change that.

-- 
Mos Eisley spaceport. You will never find a more wretched hive of
        scum and villainy. We must be cautious.

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