Mac OS Keychain with SMTP

[Paul Rankin <paul@tilk.co>]

Hello,

I'd like to eschew an .authinfo file in favour of the Mac OS Keychain
but can't seem to get it going. I keep receiving the error:

    auth-source-macos-keychain-search: The MacOS Keychain auth-source
    backend doesn't support creation yet

Some relevant excerpts from my init file:

    '(auth-sources (quote (macos-keychain-internet macos-keychain-generic)))
    '(smtpmail-smtp-server "mail.example.com")
    '(smtpmail-smtp-service 465)
    '(smtpmail-smtp-user "user@example.com")
    '(smtpmail-stream-type (quote ssl))
    '(send-mail-function (quote smtpmail-send-it))

I have created an entry with Keychain Access in my default keychain with
the following:

Keychain Item Name:  mail.example.com
Account Name:        user@example.com
Password:            password12345

The following commands return the password:

    $ security find-generic-password -l mail.example.com -a user@example.com -w
    => password12345
    $ security find-generic-password -s mail.example.com -a user@example.com -w
    => password12345

However, if I eval

    (auth-source-search :label "mail.example.com")
    => nil
    (auth-source-search :server "mail.example.com")
    = nil
    (auth-source-search :label "mail.example.com" :user "user@example.com")
    => nil

The Mac OS authorisation popup appears, but I can't tell whether it's
returning the password...

I have the `security` retrieval method working for OfflineIMAP using the
real Keychain entry, so it's not a user/password problem.

I'm happy to switch to another `send-mail-function`. If anyone has
working SMTP email with Mac OS Keychain auth I would love some pointers :)

Many thanks,

-- 
Paul W. Rankin
http://www.paulwrankin.com

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