Sendmail

resend mails

sendmail -q -v

delete mails from a recipiant

sendmail -qR -v hotmail.com

Who owns mails with problem

mailq | grep @ | grep -v ^k | cut -d \< -f 2 | cut -d @ -f2 | awk '{print $1}' | sort | uniq -c | sort -n | grep -v `hostname` | cut -d \> -f 1| tail

send mail with netcat

[user@host]# telnet smtp.domain.com 25
Trying 192.168.0.1...
Connected to smtp.domain.com (192.168.0.1).
Escape character is '^]'.
220 myrelay.domain.com ESMTP
HELO smtp.domain.com
250 myrelay.domain.com
MAIL FROM:<alice@hacker.com>
250 sender <alice@hacker.com> ok
RCPT TO:<bob@secure.net>
250 recipient <bob@secure.net> ok
DATA
354 go ahead
From: [Alice Hacker] <alice@hacker.com>
To: [Bob Smith] <bob@secure.net>
Date: Mon, 12 Apr 2010 14:21:26 -0400
Subject: Test Message

Hi there!
This is supposed to be a real email...

Have a good day!
Alice


.
250 ok:  Message 222220902 accepted
QUIT
221 myrelay.domain.com
Connection closed by foreign host.

SMTP servers for internet providers

mailrelay.bostream.com 		smtp
smtp.bredband.net		smtp

smarthost

set smarthost and domain. /etc/mail/sendmail.mc define(`SMART_HOST', `smtp.bredband.net')

LOCAL_DOMAIN(`www.halfface.se')dnl

sendmail listen on all network interfaces

Enable smtp on all interfaces.

/etc/mail/sendmail.mc DAEMON_OPTIONS(`Port=smtp,Name=MTA')dnl

Usermappings

/etc/mail/virtusertable

anden@halfface.se bjorklun andreas.bjorklund@halfface.se bjorklun stannaks@halfface.se stannaks none@halfface.se error:nouser 550 No such user here wrong@halfface.se error:5.7.0:550 Address invalid @halfface.se bjorklun anna-karin@sivberg.se stannaks @sivberg.se stannaks @mobbad. bjorklun @anden.homeip.net bjorklun

aliases for your host

<verbatim> /etc/mail/local-host-names

anden.homeip.net www.halfface.se halfface.se www.mobbad.nu mobbad.nu www.sivberg.se sivberg.se

Access rights. Who can send mail and username and password at www.bredband.net smtp server.

<verbatim> /etc/mail/access

localhost.localdomain RELAY localhost RELAY 127.0.0.1 RELAY 192.168.2.1 RELAY 192.168.3.1 RELAY AuthInfo:smtp.bredband.net "U:b586378" "I:b586378" "P:??????" "M:LOGIN PLAIN"

Forward a copy of email.

~/.forward

\bjorklun andreas.bjorklund@infineon.com

sending mail from command line

From: "From hoever" <email@inter.net>
To: "Andreas halfface Bjorklund" <email@inter.net>
Subject: Test Email
MIME-Version: 1.0
Content-Type: text/plain

Andreas Bjorklund doing test. anden@halfface.se

# cat /tmp/sendmail.txt | sendmail -i -t

explained

   2.1.2. Header Field: From

   Description:  
       Mailbox of message author  
   [...]  
   Related information:
       Specifies the author(s) of the message; that is, the mailbox(es)
       of the person(s) or system(s) responsible for the writing of the
       message. Defined as standard by RFC 822.

   2.1.3. Header Field: Sender

   Description:  
       Mailbox of message sender  
   [...]  
   Related information:
       Specifies the mailbox of the agent responsible for the actual
       transmission of the message.  Defined as standard by RFC 822.

   2.1.22. Header Field: Return-Path

   Description:
       Message return path
   [...]  
   Related information:
       Return path for message response diagnostics. See also RFC 2821
       [17]. Defined as standard by RFC 822.

mail headers

Accept-Language mail [RFC4021]
Alternate-Recipient mail [RFC4021]
Archived-At prov/archived-at mail standard [RFC5064]
Authentication-Results mail standard [RFC7601]
Auto-Submitted mail standard [RFC3834 section 5]
Autoforwarded mail [RFC4021]
Autosubmitted mail [RFC4021]
Bcc mail standard [RFC5322]
Cc mail standard [RFC5322]
Comments mail standard [RFC5322]
Content-Identifier mail [RFC4021]
Content-Return mail [RFC4021]
Conversion mail [RFC4021]
Conversion-With-Loss mail [RFC4021]
DL-Expansion-History mail [RFC4021]
Date mail standard [RFC5322]
Deferred-Delivery mail [RFC4021]
Delivery-Date mail [RFC4021]
Discarded-X400-IPMS-Extensions mail [RFC4021]
Discarded-X400-MTS-Extensions mail [RFC4021]
Disclose-Recipients mail [RFC4021] 
Disposition-Notification-Options mail [RFC4021]
Disposition-Notification-To mail [RFC4021]
DKIM-Signature mail standard [RFC6376]
Downgraded-Bcc mail obsoleted [RFC5504][RFC6857]
Downgraded-Cc mail obsoleted [RFC5504][RFC6857]
Downgraded-Disposition-Notification-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Final-Recipient mail standard [RFC6857 Section 3.1.10]
Downgraded-From mail obsoleted [RFC5504][RFC6857 Section 3.1.10]
Downgraded-In-Reply-To mail standard [RFC6857 Section 3.1.10]
Downgraded-Mail-From mail obsoleted [RFC5504][RFC6857 Section 3.1.10]
Downgraded-Message-Id mail standard [RFC6857 Section 3.1.10]
Downgraded-Original-Recipient mail standard [RFC6857 Section 3.1.10]
Downgraded-Rcpt-To mail obsoleted [RFC5504][RFC6857]
Downgraded-References mail standard [RFC6857 Section 3.1.10]
Downgraded-Reply-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Bcc mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Cc mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-From mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Reply-To mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-Sender mail obsoleted [RFC5504][RFC6857]
Downgraded-Resent-To mail obsoleted [RFC5504][RFC6857] 
Downgraded-Return-Path mail obsoleted [RFC5504][RFC6857]
Downgraded-Sender mail obsoleted [RFC5504][RFC6857]
Downgraded-To mail obsoleted [RFC5504][RFC6857]
Encoding mail [RFC4021]
Encrypted mail [RFC4021]
Expires mail [RFC4021]
Expiry-Date mail [RFC4021]
From mail standard [RFC5322][RFC6854]
Generate-Delivery-Report mail [RFC4021]
Importance mail [RFC4021]
In-Reply-To mail standard [RFC5322]
Incomplete-Copy mail [RFC4021]
Keywords mail standard [RFC5322]
Language mail [RFC4021]
Latest-Delivery-Time mail [RFC4021]
List-Archive mail [RFC4021]
List-Help mail [RFC4021]
List-ID mail [RFC4021]
List-Owner mail [RFC4021]
List-Post mail [RFC4021]
List-Subscribe mail [RFC4021]
List-Unsubscribe mail [RFC4021]
Message-Context mail [RFC4021]
Message-ID mail standard [RFC5322]
Message-Type mail [RFC4021]
MMHS-Exempted-Address mail [RFC6477][ACP123 Appendix A1.1 and Appendix B.105]
MMHS-Extended-Authorisation-Info mail [RFC6477][ACP123 Appendix A1.2 and Appendix B.106]
MMHS-Subject-Indicator-Codes mail [RFC6477][ACP123 Appendix A1.3 and Appendix B.107]
MMHS-Handling-Instructions mail [RFC6477][ACP123 Appendix A1.4 and Appendix B.108]
MMHS-Message-Instructions mail [RFC6477][ACP123 Appendix A1.5 and Appendix B.109]
MMHS-Codress-Message-Indicator mail [RFC6477][ACP123 Appendix A1.6 and Appendix B.110]
MMHS-Originator-Reference mail [RFC6477][ACP123 Appendix A1.7 and Appendix B.111]
MMHS-Primary-Precedence mail [RFC6477][ACP123 Appendix A1.8 and Appendix B.101]
MMHS-Copy-Precedence mail [RFC6477][ACP123 Appendix A1.9 and Appendix B.102]
MMHS-Message-Type mail [RFC6477][ACP123 Appendix A1.10 and Appendix B.103]
MMHS-Other-Recipients-Indicator-To mail [RFC6477][ACP123 Appendix A1.12 and Appendix B.113]
MMHS-Other-Recipients-Indicator-CC mail [RFC6477][ACP123 Appendix A1.12 and Appendix B.113]
MMHS-Acp127-Message-Identifier mail [RFC6477][ACP123 Appendix A1.14 and Appendix B.116]
MMHS-Originator-PLAD mail [RFC6477][ACP123 Appendix A1.15 and Appendix B.117]
MT-Priority mail standard [RFC6758]
Obsoletes mail [RFC4021]
Organization mail informational [RFC7681]
Original-Encoded-Information-Types mail [RFC4021]
Original-From mail standard [RFC5703]
Original-Message-ID mail [RFC4021]
Original-Recipient perm/original-recipient mail standard [RFC3798][RFC5337]
Originator-Return-Address mail [RFC4021]
Original-Subject mail standard [RFC5703]
PICS-Label mail [RFC4021]
Prevent-NonDelivery-Report mail [RFC4021]
Priority mail [RFC4021]
Received mail standard [RFC5322][RFC5321]
Received-SPF mail standard [RFC7208]
References mail standard [RFC5322]
Reply-By mail [RFC4021]
Reply-To mail standard [RFC5322]
Require-Recipient-Valid-Since mail standard [RFC7293]
Resent-Bcc mail standard [RFC5322]
Resent-Cc mail standard [RFC5322]
Resent-Date mail standard [RFC5322]
Resent-From mail standard [RFC5322][RFC6854]
Resent-Message-ID mail standard [RFC5322]
Resent-Reply-To mail obsoleted [RFC5322]
Resent-Sender mail standard [RFC5322][RFC6854]
Resent-To mail standard [RFC5322]
Return-Path mail standard [RFC5322]
Sender mail standard [RFC5322][RFC6854]
Sensitivity mail [RFC4021]
Solicitation mail [RFC3865]
Subject mail standard [RFC5322]
Supersedes mail [RFC4021]
To mail standard [RFC5322]
VBR-Info mail standard [RFC5518]
X400-Content-Identifier mail [RFC4021]
X400-Content-Return mail [RFC4021]
X400-Content-Type mail [RFC4021]
X400-MTS-Identifier mail [RFC4021]
X400-Originator mail [RFC4021]
X400-Received mail [RFC4021]
X400-Recipients mail [RFC4021]
X400-Trace mail [RFC4021]