All kept message folders Empty since update to Email Client Settings

[EricC]

Manually changed.

Which I have now left blank.

[licquorice]

To be fair, SSL and TLS are separate protocols but as far as I'm aware BT still use SSL. Certainly changing Outlook 2010 to TLS (as opposed to either SSL or SSL/TLS) results in failure to send or receive mail.

[gg30340]

Do not send the email. Go into the headers of the email and it will show you the senders details. To do that log onto your email account using a web browser then select the email and click "More" in the menu bar and then select on the "View Source".

[licquorice]

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@EricCwrote:

Manually changed.

From?

Which I have now left blank.

That won't work

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[EricC]

I am not using Outlook, I am on a Mac running OS Tahoe 26.6 using Apple Mail.

[EricC]

It does work, as since I changed it I still received notification of your reply.

[licquorice]

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@EricCwrote:
I am not using Outlook, I am on a Mac running OS Tahoe 26.6 using Apple Mail.

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The settings are universal, not client specific. I asked what the setting was before you changed it.

[licquorice]

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@EricCwrote:
It does work, as since I changed it I still received notification of your reply.

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It must have entered a value or it wouldn't work. A port number is like an extension number of a switchboard in phone terms. Just getting to the switchboard doesn't get you to the person (server) you need to speak to.

[EricC]

I am not sure but I think that it was IMAP (Incoming): Port 143 (no encryption)

[EricC]

I about to reinstall my OS etc  from a Time Machine backup to see if that fixes things.