Sendmail - Revision history

Paul Blankenbaker at 13:51, 7 June 2018

2018-06-07T13:51:07Z

@@ Line 19: / Line 19: @@
 All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".
-== How To Configure SSL Relay for verizon.net ==
+== Accept/Reject Mail from Selected Domains/Hosts ==
 This following shows the procedure and config entries to facilitate using sendmail on an NST system for relay and authentication.
@@ Line 64: / Line 131: @@
 You can use the following examples to test the sendmail configuration:
-  echo "Test from $(hostname) on $(date)" | mailx -v -s "Test from $(hostname)" -r "FROM_EMAIL_ADDR" "TO_EMAIL_ADDR"
+ FROM="USER@DOMAIN"
   mail;
   mailq;
@@ Line 71: / Line 140: @@
-== How To Configure SSL Relay for att.net ==
+== How To Configure for att.net with SSL/TLS ==
-This following shows the procedure and config entries to facilitate using sendmail on an NST system for relay and authentication on a residential AT&T Fiber connection circa 2018. It is similar to the Verizon configuration.
+This following shows the procedure and config entries to facilitate using sendmail on an NST system for relay and authentication on a residential AT&T Fiber connection circa 2018. It is similar to the Verizon configuration, but requires TLS for communications to the server.
 Problem: AT&T blocks TCP port 25, therefore a relay setup to smtp.mail.att.net is used. Reference: https://www.linuxquestions.org/questions/slackware-14/sendmail-smtp-auth-howto-224543/
 === Stop the sendmail Service ===
@@ Line 125: / Line 198: @@
 You can use the following examples to test the sendmail configuration:
-  set FROM="USER@DOMAIN"
+  FROM="USER@DOMAIN"
-  set TO="USER@DOMAIN"
+  TO="USER@DOMAIN"
-  echo "Test from $(hostname) on $(date)" | mailx -v -s "Test from $(hostname)" -r "${FROM}" "${TO}"
+  echo "Test sent from ${FROM} to ${TO} from host $(hostname) on $(date)" | mailx -v -s "Test from $(hostname)" -r "${FROM}" "${TO}"
   mail;
   mailq;
   tail -6 /var/log/maillog;

Paul Blankenbaker at 22:38, 6 June 2018

2018-06-06T22:38:24Z

← Older revision		Revision as of 18:38, 6 June 2018
Line 18:		Line 18:

	All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".		All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".

			== How To Configure SSL Relay for verizon.net ==

			This following shows the procedure and config entries to facilitate using sendmail on an NST system for relay and authentication.

			Problem: Verizon blocks TCP port 25, therefore a relay setup to smtp.aol.com (Verizon uses AOL email) is used. Reference: https://www.linuxquestions.org/questions/slackware-14/sendmail-smtp-auth-howto-224543/

			=== Stop the sendmail Service ===

			systemctl stop sendmail.service;

			=== Create authinfo file: "/etc/mail/auth/authinfo" ===

			Following shows contents of ''/etc/mail/auth/authinfo''. NOTE: Change USERID and PASSWORD to the verizon.net account you will be using to send mail with.

			AuthInfo:smtp.aol.com "U:USERID@verizon.net" "P:PASSWORD" "M:PLAIN"
			AuthInfo: "U:USERID@verizon.net" "P:PASSWORD" "M:PLAIN"

			=== Compile ===

			cd "/etc/mail/auth";
			makemap hash authinfo < authinfo;

			=== Create Relay Entries ===

			Add the following entries to the file: "/etc/mail/sendmail.mc"

			define(`SMART_HOST',`smtp.aol.com')dnl
			define(`RELAY_MAILER',`esmtp')dnl
			define(`RELAY_MAILER_ARGS', `TCP $h 587')dnl
			define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
			FEATURE(`authinfo',`hash /etc/mail/auth/authinfo')dnl

			=== Compile ===

			cd "/etc/mail";
			m4 sendmail.mc > /etc/mail/sendmail.cf;

			=== Start the sendmail Service ===

			systemctl start sendmail.service;

			=== Testing ===

			You can use the following examples to test the sendmail configuration:

			echo "Test from $(hostname) on $(date)" \| mailx -v -s "Test from $(hostname)" -r "FROM_EMAIL_ADDR" "TO_EMAIL_ADDR"
			mail;
			mailq;
			tail -6 /var/log/maillog;
			sendmail -d0.1 -bv;


			== How To Configure SSL Relay for att.net ==

			This following shows the procedure and config entries to facilitate using sendmail on an NST system for relay and authentication on a residential AT&T Fiber connection circa 2018. It is similar to the Verizon configuration.

			Problem: AT&T blocks TCP port 25, therefore a relay setup to smtp.mail.att.net is used. Reference: https://www.linuxquestions.org/questions/slackware-14/sendmail-smtp-auth-howto-224543/

			=== Stop the sendmail Service ===

			systemctl stop sendmail.service;

			=== Create authinfo file: "/etc/mail/auth/authinfo" ===

			Create the ''auth'' sub-directory (if not present).

			install -d /etc/mail/auth

			Following shows contents of ''/etc/mail/auth/authinfo''. NOTE: Change USERID and PASSWORD to the att.net account you will be using to send mail with.

			AuthInfo:smtp.mail.att.net "U:USERID@att.net" "P:PASSWORD" "M:PLAIN"
			AuthInfo: "U:USERID@att.net" "P:PASSWORD" "M:PLAIN"

			Change permissions to ''600'' so password can only be viewed by the root user.

			chmod 600 /etc/mail/auth/authinfo

			=== Compile ===

			cd "/etc/mail/auth";
			makemap hash authinfo < authinfo;

			=== Create Relay Entries ===

			Add the following entries to the file: "/etc/mail/sendmail.mc". This can go near the end of the file, but needs to be prior to the ''MAILER'' directives.

			define(`SMART_HOST',`smtp.mail.att.net')dnl
			define(`RELAY_MAILER',`esmtp')dnl
			define(`RELAY_MAILER_ARGS', `TCP $h 465')dnl
			define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
			FEATURE(`authinfo',`hash /etc/mail/auth/authinfo')dnl

			=== Compile ===

			cd "/etc/mail";
			m4 sendmail.mc > /etc/mail/sendmail.cf;

			=== Start the sendmail Service ===

			systemctl start sendmail.service;
			systemctl enable sendmail.service;

			=== Testing ===

			You can use the following examples to test the sendmail configuration:

			set FROM="USER@DOMAIN"
			set TO="USER@DOMAIN"
			echo "Test from $(hostname) on $(date)" \| mailx -v -s "Test from $(hostname)" -r "${FROM}" "${TO}"
			mail;
			mailq;
			tail -6 /var/log/maillog;
			sendmail -d0.1 -bv;

Rwh: /* How To Flush Out A Specific Email Message From The Sendmail Queue */

2007-03-30T00:01:51Z

How To Flush Out A Specific Email Message From The Sendmail Queue

← Older revision		Revision as of 20:01, 29 March 2007
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	== How To Flush Out A Specific Email Message From The Sendmail Queue ==		== How To Flush Out A Specific Email Message From The Sendmail Queue ==

	"'''sendmail'''" can be told to <u>only</u> flush certain emails from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient's address:		"'''sendmail'''" can be told to <u>only</u> flush out certain emails from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient's address:

	<div class="screen">		<div class="screen">

Rwh at 00:01, 30 March 2007

2007-03-30T00:01:24Z

← Older revision		Revision as of 20:01, 29 March 2007
Line 7:		Line 7:
	</div>		</div>

	== How To Flush A Specific Email Message From The Sendmail Queue ==
			== How To Flush Out A Specific Email Message From The Sendmail Queue ==

	"'''sendmail'''" can be told to <u>only</u> flush certain emails from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient's address:		"'''sendmail'''" can be told to <u>only</u> flush certain emails from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient's address:

	<div class="screen">		<div class="screen">
	<div class="screenTitle">Try To Flush A Specific "''sendmail''" Queued Email Message:</div>		<div class="screenTitle">Try To Flush Out A Specific "''sendmail''" Queued Email Message:</div>
	<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>		<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>
	</div>		</div>

	All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".		All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".

Rwh: /* How To Flush All Email Messages From The Sendmail Queue */

2007-03-30T00:00:56Z

How To Flush All Email Messages From The Sendmail Queue

← Older revision		Revision as of 20:00, 29 March 2007
Line 1:		Line 1:
	== How To Flush All Email Messages From The Sendmail Queue ==		== How To Flush Out All Email Messages From The Sendmail Queue ==
	Sometimes email messages can be <u>queued</u> <u>up</u> with the Mail Transport Agent: "'''sendmail'''". The following command line can be used to <u>manually</u> try to immediately flush out <u>'''All'''</u> emails queued up by "'''sendmail'''". Even though a "'''sendmail'''" service may be running, this command is <u>'''Ok'''</u> to use, it will only run once and then terminate.		Sometimes email messages can be <u>queued</u> <u>up</u> with the Mail Transport Agent: "'''sendmail'''". The following command line can be used to <u>manually</u> try to immediately flush out <u>'''All'''</u> emails queued up by "'''sendmail'''". Even though a "'''sendmail'''" service may be running, this command is <u>'''Ok'''</u> to use, it will only run once and then terminate.

	<div class="screen">		<div class="screen">
	<div class="screenTitle">Try To Flush The Entire "''sendmail''" Queue:</div>		<div class="screenTitle">Try To Flush Out The Entire "''sendmail''" Queue:</div>
	<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -q -v</div>		<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -q -v</div>
	</div>		</div>


	== How To Flush A Specific Email Message From The Sendmail Queue ==		== How To Flush A Specific Email Message From The Sendmail Queue ==

Rwh: /* How To Flush A Specific Email Message From The Sendmail Queue */

2007-03-30T00:00:16Z

How To Flush A Specific Email Message From The Sendmail Queue

← Older revision		Revision as of 20:00, 29 March 2007
Line 13:		Line 13:

	<div class="screen">		<div class="screen">
	<div class="screenTitle">Try To Flush A Specific "'''sendmail'''" Queued Email Message:</div>		<div class="screenTitle">Try To Flush A Specific "''sendmail''" Queued Email Message:</div>
	<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>		<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>
	</div>		</div>

	All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".		All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".

Rwh: /* How To Flush A Specific Email Message From The Sendmail Queue */

2007-03-29T23:59:10Z

How To Flush A Specific Email Message From The Sendmail Queue

← Older revision		Revision as of 19:59, 29 March 2007
Line 10:		Line 10:
	== How To Flush A Specific Email Message From The Sendmail Queue ==		== How To Flush A Specific Email Message From The Sendmail Queue ==

	"'''sendmail'''" can be told to only flush certain ~~items~~ from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient:		"'''sendmail'''" can be told to <u>only</u> flush certain emails from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient's address:

	<div class="screen">		<div class="screen">
	<div class="screenTitle">Try To Flush A Specific "''sendmail''" Queued Email Message:</div>		<div class="screenTitle">Try To Flush A Specific "'''sendmail'''" Queued Email Message:</div>
	<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>		<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>
	</div>		</div>

	All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out.		All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out. You can also use "'''-qS'''" to match on the "'''sender'''" and "'''-qI'''" to match on the "'''queue ID'''".

Rwh: /* How To Flush A Specific Email Message From The Sendmail Queue */

2007-03-29T23:54:20Z

How To Flush A Specific Email Message From The Sendmail Queue

← Older revision		Revision as of 19:54, 29 March 2007
Line 11:		Line 11:

	"'''sendmail'''" can be told to only flush certain items from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient:		"'''sendmail'''" can be told to only flush certain items from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient:

			<div class="screen">
			<div class="screenTitle">Try To Flush A Specific "''sendmail''" Queued Email Message:</div>
			<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -qR "securecomputing.com" -v</div>
			</div>

			All '''queued''' email messages with a recipient address that matches: "'''securecomputing.com'''" will be flushed out.

Rwh: /* How To Flush All Email Messages From The Sendmail Queue */

2007-03-29T23:50:27Z

How To Flush All Email Messages From The Sendmail Queue

← Older revision		Revision as of 19:50, 29 March 2007
Line 8:		Line 8:


	== How To Flush ~~All~~ Email ~~Messages~~ From The Sendmail Queue ==		== How To Flush A Specific Email Message From The Sendmail Queue ==

			"'''sendmail'''" can be told to only flush certain items from the "'''queue'''" with an additional argument to "'''-q'''". One can <u>flush</u> email messages that match a <u>specific</u> recipient:

Rwh at 23:47, 29 March 2007

2007-03-29T23:47:32Z

← Older revision		Revision as of 19:47, 29 March 2007
Line 6:		Line 6:
	<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -q -v</div>		<div class="userInput"><span class="prompt">[root@probe-222 root]# </span>/usr/local/sbin/sendmail -q -v</div>
	</div>		</div>


	== How To Flush All Email Messages From The Sendmail Queue ==		== How To Flush All Email Messages From The Sendmail Queue ==