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sendmail FAQ

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Posted-By: auto-faq 3.3 (Perl 5.008)
Archive-name: mail/sendmail/faq
Posting-Frequency: posted on the 10th and 25th of each month
Last-modified: January 1, 2010
Maintainer: Sendmail FAQ <>

See reader questions & answers on this topic! - Help others by sharing your knowledge
                      Frequently Asked Questions (FAQ)

                        Last updated January 1, 2010

          Changes since the last post on 10 Jan 2009 12:00:02 PST
            * none

Top 5 - the *most* frequently asked questions about sendmail:

    1. Local config error: see 4.5
    2. Relaying denied: see 3.27
    3. Directory permissions: see 3.33
    4. Virtual hosting: see 3.7 & 3.28
    5. POP / IMAP: see 4.19
Table of Contents



     + 2.1 What is this newsgroup?
     + 2.2 What is the scope of this FAQ?
     + 2.3 Where can I find the latest version of this FAQ?
     + 2.4 Where can I send comments, questions and bug reports?
     + 2.5 Where can I ask email-related DNS questions?
     + 2.6 How can I subscribe to these newsgroups?
     + 2.7 Which version of sendmail should I run?
     + 2.8 What is the latest release of sendmail?
     + 2.9 Where can I find it?
     + 2.10 What are the differences between Version 8 and other versions?
     + 2.11 What's the best platform for running sendmail?
     + 2.12 What is BIND and where can I get the latest version?
     + 2.13 What is smrsh and where can I get it?
     + 2.14 What is smap and where can I get it?
     + 2.15 What is TCP-Wrappers and where can I get it?
     + 2.16 Why won't db 1.85 build on my machine?
     + 2.17 What is makemap and where can I get it?


     + 3.1 How do I make all my addresses appear to be from a single host?
     + 3.2 How do I rewrite my "From:" lines to read
           ``First_Last@My.Domain'' or ``Different_Name@My.Domain''?
     + 3.3 But what about fully-qualified addresses, such as those from Pine
           or FEATURE(always_add_domain)?
     + 3.4 So what was the user database feature intended for?
     + 3.5 Why the hostility to using full names for email addresses?
     + 3.6 deprecated
     + 3.7 How do I manage several (virtual) domains?
     + 3.8 There are four UUCP mailers listed in the configuration files.
           Which one should I use?
     + 3.9 deprecated
     + 3.10 How do I solve "collect: I/O error on connection" or
           "reply: read error from" errors?
     + 3.11 Why can't my users forward their mail to a program?
     + 3.12 Why do connections to the SMTP port take such a long time?
     + 3.13 Why do I get "unknown mailer error 5 -- mail: options MUST
            PRECEDE recipients" errors?
     + 3.14 Why does version 8 sendmail panic my SunOS box?
     + 3.15 Why does the Unix From line get mysteriously munged when I send
            to an alias?
     + 3.16 Why doesn't MASQUERADE_AS (or the user database) work
            for envelope addresses as well as header addresses?
     + 3.17 How do I run version 8 sendmail and support the MAIL11V3 protocol?
     + 3.18 Why do messages disappear from my queue unsent?
     + 3.19 When is sendmail going to support RFC 2047 MIME header encoding?
     + 3.20 Why can't I get mail to some places, but instead always get
            the error "reply: read error from"?
     + 3.21 Why doesn't "FEATURE(xxx)" work?
     + 3.22 How do I configure sendmail not to use DNS?
     + 3.23 How do I get all my queued mail delivered to my Unix box from
            my ISP?
     + 3.24 Why do I get the error message unable to write
     + 3.25 Why can't I compile sendmail with Berkeley DB 2.X?
     + 3.26 What operating systems has Berkeley sendmail been ported to?
     + 3.27 How do I prevent "Relaying Denied" errors for my clients?
     + 3.28 Why isn't virtual hosting working, even after I added a
            "Kvirtuser" line to ?
     + 3.29 How can I add a header specifying the actual recipient when having
            multiple users in a virtual domain go to a single mailbox?
     + 3.30 What do I do when Build fails because groff was not found? 
     + 3.31 What does "class hash not available" mean?
     + 3.32 How do I configure majordomo with sendmail 8.9 without relaxing
            the DontBlameSendmail option?
     + 3.33 How do I configure my system in general with sendmail 8.9?
     + 3.34 What does "foo not available for sendmail programs" mean?
     + 3.35 How do I add a footer/signature to all (outgoing) e-mail messages? 
     + 3.36 What does "Cannot open hash database ... Invalid argument" mean?
     + 3.37 What does "parse error before `NDBM'" mean?
     + 3.38 What does "may be forged" mean?
     + 3.39 How do I send using an alternate port?
     + 3.40 Why can't I use Berkeley DB 4.1.x?
     + 3.41 How do I use CIDR notation in the access map (or other places)?
     + 3.42 Why isn't CIDR notation directly supported by sendmail?
     + 3.43 What does "Need to recompile with -DNEWDB for hash support" mean?
     + 3.44 I disabled sendmail on some machines which don't receive mail,
            but since upgrading to 8.12 they can't *send* mail either; why?


     + 4.1 Should I use a wildcard MX for my domain?
     + 4.2 How can I set up an auto-responder?
     + 4.3 How can I get sendmail to deliver local mail to $HOME/.mail
           instead of into /usr/spool/mail (or /usr/mail)?
     + 4.4 Why does it deliver the mail interactively when I'm trying to get
           it to go into queue only mode?
     + 4.5 How can I solve "MX list for hostname points back to hostname"
           and "config error: mail loops back to myself" messages?
     + 4.6 Why does my sendmail process sometimes hang when connecting over
           a SLIP/PPP link?
     + 4.7 How can I summarize the statistics generated by sendmail in the
     + 4.8 How can I check my to ensure that it's re-writing
           addresses correctly?
     + 4.9 What is procmail, and where can I get it?
     + 4.10 How can I solve "cannot alias non-local names" errors?
     + 4.11 Is sendmail Year 2000 (Y2K) compliant?
     + 4.12 How can I batch remote mail to be sent using my ISP while
            delivering local mail immediately?
     + 4.13 What does "unknown mailer error 1" mean?
     + 4.14 How do I queue mail for another domain?
     + 4.15 How do I create attachments with sendmail?
     + 4.16 How do I find sendmail's version number?
     + 4.17 How do I handle user names with upper-case characters?
     + 4.18 What does "NOQUEUE: Null connection from ..." mean?
     + 4.19 How do I configure sendmail for POP/IMAP/... ?
     + 4.20 How can I automatically copy messages based on sender or
            recipient addresses?
     + 4.21 How can I send mail to all users?
     + 4.22 Why can't I receive external mail?
     + 4.23 How do I restrict attachments with sendmail?
     + 4.24 Can I get sendmail to verify an entire e-mail address instead
            of just the domain?


     + 5.1 Sun Microsystems SunOS/Solaris 1.x/2.x

          o 5.1.1 How can I solve "line 273: replacement $3 out of bounds"
          o 5.1.2 How can I solve "line 445: bad ruleset 96 (50 max)" errors?
          o 5.1.3 Why does version 8 sendmail (< 8.7.5) sometimes hang
                  under Solaris 2.5?
          o 5.1.4 Why can't I use SunOS/Solaris to get email to certain
                  large sites?
          o 5.1.5 Why do I have trouble compiling on Solaris?
          o 5.1.6 How does 8.X compare to 8.X+Sun?

     + 5.2 IBM AIX

          o 5.2.1 The system resource controller always reports sendmail
                  as "inoperative". What's wrong?
          o 5.2.2 Why can't I use AIX to get email to some sites?
          o 5.2.3 Why can't I get sendmail 8.7.1 to use MX records with
                  AIX 3.2.5?

     + 5.3 Linux

          o 5.3.1 Red Hat

         Why do I have so many sendmail problems after
                           configuring sendmail with linuxconf?
         I built from and it works
                           until the next reboot of the machine.  What is
                           going on?
         Why can't I receive mail with Red Hat 7.1 and later?

          o 5.3.2 SuSE

         Where is the file on SuSE Linux?

  * 6. ADDITIONAL INFORMATION SOURCES (RFC 1807 bibliography format)

     + 6.1 Reference material devoted exclusively to sendmail
     + 6.2 Reference material with chapters or sections on sendmail
     + 6.3 Reference material on subjects related to sendmail
     + 6.4 World-wide web index pages on sendmail
     + 6.5 World-wide web index pages Internet email in general
     + 6.6 Online tutorials for sendmail
     + 6.7 Online archives of mailing lists and Usenet newsgroups,
           relating to Internet email

  * 7. THANKS!
-- John
           relating to Internet email

  * 7. THANKS!
-- John

Sponsor my 100-mile bike ride fund raiser for the American Lung Association

User Contributions:

Report this comment as inappropriate
Aug 18, 2019 @ 3:03 am
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