smtpmail: Debugging
7 Debugging
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Sometimes delivery fails, often with the generic error message ‘Sending
failed; SMTP protocol error’. Enabling one or both of the following
variables and inspecting a trace buffer will often give clues to the
reason for the error.
‘smtpmail-debug-info’
The variable ‘smtpmail-debug-info’ controls whether to print the
SMTP protocol exchange in the minibuffer, and retain the entire
exchange in a buffer ‘*trace of SMTP session to SERVER*’, where
SERVER is the name of the mail server to which you send mail.
‘smtpmail-debug-verb’
The variable ‘smtpmail-debug-verb’ controls whether to send the
‘VERB’ token to the server. The ‘VERB’ server instructs the server
to be more verbose, and often also to attempt final delivery while
your SMTP session is still running. It is usually only useful
together with ‘smtpmail-debug-info’. Note that this may cause mail
delivery to take considerable time if the final destination cannot
accept mail.
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