Provided by: courier-faxmail_0.47-13ubuntu5_i386 bug


       courierfax - Send faxes via E-mail


       sendmail [ 5558888@fax ]

       sendmail [ 5558888@fax-lowres ]

       sendmail [ 5558888@fax-ignore ]

       sendmail [ 5558888@fax-cover ]


       The courierfax module (if enabled by the system administrator) sends E-
       mail messages by fax.  Addressing an  E-mail  message  to  the  address
       5558888@fax  faxes a printed copy of the message to the specified phone

       The ability to send faxes may be restricted, or not available.  The  E-
       mail  message  may  be  a  MIME-formatted message.  All attachments are
       concatenated  and  sent  together  in  a   single   fax   transmission.
       courierfax  only  knows  how  to  handle  certain  kinds  of  attached.
       Obviously, trying to fax a voice .mp3 attaching is not going  to  work.
       courierfax  knows  how  to  handle plain text, Postscript, and PDF MIME
       attachments.  courierfax might also know what to do with other kinds of
       attachment, depending on some optional software installed by the system
       administrator.  courierfax may also be able to read GIF, PNG, and  JPEG

              Note: Color images are converted to black-and-white.

       Images  are  faxed with one image per fax page (limiting image sizes to
       about 1600x2200).

       The message will be returned as  undeliverable  if  courierfax  doesn’t
       know how to handle a MIME attachment.  If the first MIME section in the
       E-mail message is plain text, the text appears on the fax  cover  page.
       The  sender/recipient  information for the cover page is taken from the
       message’s headers.

       The default courierfax configuration tries to resend the fax for up  to
       eight hours, after which the message is returned as undeliverable.  The
       message will also be returned as undeliverable if the fax  transmission
       is  interrupted.   The  return  bounce  will  state how many pages were
       successfully transmitted.

       "@fax" may also be followed by additional keywords that  specify  extra

              Send a low-resolution fax.

              Ignore  any attachment types that courierfax doesn’t understand.

       -cover Send a cover page only.  This is useful in  limited  situations,
              with something like this in a dot-courier(5) file:

               ! 5552222@fax-cover

              This  .courier  file  faxes  the contents of a message, sans any
              attachments, immediately upon receipt in addition to saving  the
              message in the mailbox.


       The  sender  will  receive  a  fax  transmission  receipt if the sender
       requests an ESMTP delivery status notification.  This is the -N  option
       to sendmail(8):

       sendmail -Nsuccess 5556666@fax <messagefile

       When   using   other   mail   software,  consult  the  mail  software’s
       documentation for instructions  on  requesting  ESMTP  delivery  status


       courierfax  configurations  that are generated by the webadmin tool for
       North  American  environments  usually  restrict  phone  numbers  to  a
       standardized  ten-digit  telephone  number,  so that the fax address is
       always <aaabbbcccc@fax>, and courierfax silently  performs  any  needed
       conversion  to  dial  the  number (such as adding ‘‘1’’ or dropping the
       local areacode).

       It is also possible to reconfigure courierfax so that  it  accepts  any
       telephone  string  and  dials it without any preprocessing.  If so, the
       address may contain any combination of digits,  letters  ‘‘A’’,  ‘‘B’’,
       ‘‘C’’,  and  ‘‘D’’,  representing  the  four  extra  dialing  tones not
       normally accessible from most telephone keypads, the symbols ‘‘*’’  and
       ‘‘#’’, or the following characters:

       W      Most  faxmodems  pause and wait for a secondary dialtone, before
              dialing the rest of the number.

       -      The dash is replaced by a comma in the dialing string.  A  comma
              results  in  most  faxmodems  pausing  for  two or three seconds
              before dialing the rest of the number.  It is  not  possible  to
              enter  a  comma  directly,  because  commas are used to separate
              multiple E-mail addresses.  Use dashes instead of commas in  the
              dialing  string.   courierfax  replaces  all  dashes with commas
              before dialing the faxmodem.

       +      Similarly, courierfax replaces all pluses with ‘‘@’’  characters
              before  dialing.   An ‘‘@’’ characters results in most faxmodems
              waiting for the line  to  be  silent  for  five  seconds  before
              dialing  the  rest of the number.  It is not possible to enter a
              ‘‘@’’ directly as part of the telephone number itself,  for  the
              obvious  reasons.   Use pluses  instead of ‘‘@’’s in the dialing
              string.   courierfax  replaces  all  pluses  with  ‘‘@’’  before
              dialing the faxmodem.


       The  slightly  arcane  configuration  file, /etc/courier/faxrc, sets up
       which dialing  strings  are  valid.   The  default  configuration  file
       contains  judicious  comments that explain all the parameters, and what
       they  do.   The  default  configuration  file  disables  courierfax  by
       rejecting all telephone numbers.  The file must be edited in accordance
       with the embedded instructions, in order to enable faxing.

       Using webadmin is  highly  recommended.   Upon  demand,  webadmin  will
       install  a suitable configuration file for the North American numbering
       plan, that receives all telephone numbers  as  ten-digit  numbers,  and
       adds any required long distance prefix, or removes the local area code,
       as appropriate.  Or, webadmin will install a  bare-bones  configuration
       file  that  dials  any  requested  phone number, without any editing or


       There is no good way to sleep until a modem lock  is  released,  so  we
       poll every minute.