[Users] claws-mail impap-error Port 993 tls on Macos

[Stephan Hesse]

Apple stores passwords in Keychain Management and in System Preferences
under Internet Accounts.

When I check my e-mails via claws-mail/imap-s, no password is requested
at this point. But this is normal under Linux. So it can't be retrieved
from the keychain administration. This is the problem. Apple wants to
collect all passwords for communication accounts in its administration.
claws-mail does not fit into this scheme. Third-party software with
TLS-Auth is probably the problem with apple.

Greetings Steffe



Am Fri, 27 Oct 2023 15:02:58 +0000
schrieb "David Fletcher" <David at megapico.co.uk>:

> >Apart from anything else, you are giving google a great deal of
> >information about both you, and your recipient.  
> 
> Using google isn't a choice - work IT is outsourced to them, I can't
> change that.
> 
> After some more investigation I'm narrowing down the issue. I can now
> reliably produce the fault, and work around it.
> 
> - This does not appear to be a TLS issue. It happens also with
> connections that are configured without TLS.
> 
> - After starting Claws if I attempt an IMAP connection with TLS I get
> a failed connection. Network log:  TLS handshake failed. Apple crash
> log reports no entry for this.
> 
> - Next attempting a POP connection (also with TLS) it will work. This
> sequence is repeatable with each Claws re-start. And once this is done
> the POP connections just work normally for that session with Claws.
> 
> I think something is not being initialised properly. Attempting to
> set up the IMAP connection sets things up so the next POP connection
> is fine. This is very strange since these are quite separate code
> areas within Claws. It seems like the kind of thing that happens with
> pointers accessing non-initialised memory. Initially the memory
> content is random or overwrites another process, but later becomes
> predictable, even if not obviously connected within the code.
> 
> I'll continue to explore things. This could be an Apple library fault.
> Also, their documentation mentions "Pointer authentication can also
> expose latent bugs in existing code" - maybe that's happening here? It
> might also be very arm64 specific.
> 
> David.
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