In SMTP-SEND-MAIL, signal a condition instead of returning funny reply
codes upon failure.
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@ -5,12 +5,14 @@ Transfer Protocol, commonly used for sending email on the Internet.
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This library provides a simple wrapper for sending complete emails as
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This library provides a simple wrapper for sending complete emails as
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well as procedures for composing custom SMTP transactions.
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well as procedures for composing custom SMTP transactions.
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The procedures described here usually return an SMTP reply code. For
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Some of the procedures described here return an SMTP reply code. For
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details, see RFC~821.
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details, see RFC~821.
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\defun{smtp-send-mail}{from to-list headers body [host]}{code list}
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\defun{smtp-send-mail}{from to-list headers body [host]}{undefined}
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\defunx{smtp-error?}{thing}{boolean}
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\defunx{smtp-recipients-rejected-error?}{thing}{boolean}
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\begin{desc}
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\begin{desc}
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This emails message \var{body} with hedaers \var{headers} to
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This emails message \var{body} with headers \var{headers} to
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recipients in list \var{to-list}, using a sender address \var{from}.
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recipients in list \var{to-list}, using a sender address \var{from}.
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The email is handed off to the SMTP server running on \var{host};
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The email is handed off to the SMTP server running on \var{host};
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default is the local host. \var{Body} is either a list of strings
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default is the local host. \var{Body} is either a list of strings
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@ -19,14 +21,18 @@ details, see RFC~821.
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association lists, mapping symbols representing RFC~822 field names
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association lists, mapping symbols representing RFC~822 field names
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to strings representing field bodies.
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to strings representing field bodies.
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This returns two values: \var{code} and \var{list}, the code
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If some transaction-related error happens, \ex{smtp-send-mail}
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returned by the server and the text message, represented as a list
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signals an \ex{smtp-error} condition with predicate
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lines. If some recipients were rejected, \ex{smtp-send-mail} sends
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\ex{smtp-error?}. More specifically, it raises an
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to the rest of the recipients, and returns code 700 and an
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\ex{smtp-recipients-rejected-error} (a subtype of \ex{smtp-error})
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association list whose elements are of the form
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if some recipients were rejected. For \ex{smtp-error}, the
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\ex{(\var{loser-recipient} \var{code} . \var{text})}---that is,
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arguments to the \ex{signal} call are the error code and the error
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for each recipient refused by the server, you get the error data
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message, represented as a list of lines. For
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sent back for that guy. The success check is \ex{(< code 400)}.
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\ex{smtp-recipients-rejected-error}, the arguments are reply code
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700 and an association list whose elements are of the form
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\ex{(\var{loser-recipient} \var{code} . \var{text})}---that is, for
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each recipient refused by the server, you get the error data sent
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back for that guy. The success check is \ex{(< code 400)}.
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\end{desc}
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\end{desc}
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\defun{smtp-expand}{name host}{code text}
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\defun{smtp-expand}{name host}{code text}
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@ -29,9 +29,14 @@
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;;; of addresses.
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;;; of addresses.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define-condition-type 'smtp-error '(error))
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(define smtp-error? (condition-predicate 'smtp-error))
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(define-condition-type 'smtp-recipients-rejected-error '(smtp-error))
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(define smtp-recipients-rejected-error?
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(condition-predicate 'smtp-recipients-rejected-error?))
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(define (smtp-send-mail from to-list headers body . maybe-host)
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(define (smtp-send-mail from to-list headers body . maybe-host)
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(call-with-current-continuation
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(lambda (bailout)
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(let* ((host (:optional maybe-host "localhost"))
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(let* ((host (:optional maybe-host "localhost"))
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(local (if (string=? host "localhost")
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(local (if (string=? host "localhost")
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(system-name) ; we don't need any DNS for that
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(system-name) ; we don't need any DNS for that
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@ -42,7 +47,9 @@
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(smtp-helo local)
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(smtp-helo local)
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(smtp-mail from))
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(smtp-mail from))
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(if (>= code 400)
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(if (>= code 400)
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(values code text) ; error
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(begin
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(smtp-quit (smtp-connection-socket connection))
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(signal 'smtp-error code text))
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;; Send over recipients and collect the losers.
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;; Send over recipients and collect the losers.
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(let ((losers (filter-map
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(let ((losers (filter-map
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(lambda (to)
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(lambda (to)
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@ -52,7 +59,7 @@
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(cond ((>= code 600)
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(cond ((>= code 600)
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(smtp-quit
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(smtp-quit
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(smtp-connection-socket connection))
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(smtp-connection-socket connection))
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(bailout code text))
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(signal 'smtp-error code text))
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(else `(,to ,code ,@text))))))
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(else `(,to ,code ,@text))))))
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to-list)))
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to-list)))
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@ -60,9 +67,9 @@
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(receive (code text)
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(receive (code text)
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(smtp-transactions connection
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(smtp-transactions connection
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(smtp-data (normalize-headers headers) body))
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(smtp-data (normalize-headers headers) body))
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(if (and (< code 400) (null? losers))
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(if (or (>= code 400)
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(values code text)
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(not (null? losers)))
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(values 700 losers))))))))))
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(signal 'smtp-recipients-rejected-error 700 losers))))))))
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(define (normalize-headers headers)
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(define (normalize-headers headers)
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(if (assq 'date headers)
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(if (assq 'date headers)
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@ -369,9 +369,8 @@
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(files (lib htmlout)))
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(files (lib htmlout)))
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(define-structure smtp smtp-interface
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(define-structure smtp smtp-interface
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(open scheme-with-scsh
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(open scheme-with-scsh
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; user-login-name and sockets
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signals conditions
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define-record-types
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define-record-types
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(subset srfi-1 (filter-map))
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(subset srfi-1 (filter-map))
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(subset srfi-13 (string-tokenize string-join))
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(subset srfi-13 (string-tokenize string-join))
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