Re: improving SMTP credential caching

[wgreenhouse-sGOZH3hwPm2sTnJN9+BGXg@public.gmane.org (W. Greenhouse)]

Hi Tom,

Tom Roche <Tom_Roche-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org> writes:

> ...I would prefer either
>
> + to make emacs (or dependency) *not* cache failed credentials
>
> + to force reauthentication (e.g., via `C-u C-c C-c`)
>
> + something else short of restarting or waiting
>
> How to do?
>
> TIA, Tom Roche <Tom_Roche-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>

The dependency implicated here is the Emacs auth-source library, which
handles credential caching for smtpmail and many other bits of Emacs.

Any of these would eliminate your problem and hopefully make using
auth-source more pleasant:

+ Best: Run Emacs under gpg-agent and using an encrypted auth-source
  file (e.g. ~/.authinfo.gpg) that includes your email account
  passwords.  Then caching is guaranteed only to happen when you entered
  the GPG passphrase correctly, and expiry will be controlled through
  the gpg-agent, by setting the --max-cache-ttl option.

+ Manual and irksome: Invoke M-x auth-source-forget-all-cached after you
  flub an SMTP password.  Or, possibly, find something in smtpmail's
  error handling to which to hook this function.

+ Worst and most inconvenient: Disable password caching entirely.
  (setq auth-source-do-cache nil)

Hope this helps,
Will

-- 
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