Office365 SMTP Relay Information - Revision history

Michael.mast at 20:27, 30 March 2021

2021-03-30T20:27:26Z

Michael.mast: /* Rewrite sender address */

2019-09-10T23:23:48Z

Rewrite sender address

Michael.mast: /* Postfix */

2019-09-10T23:08:16Z

Postfix

Michael.mast at 22:32, 7 September 2019

2019-09-07T22:32:51Z

Michael.mast: /* Externally Accessible Relay */

2019-06-25T12:39:25Z

Externally Accessible Relay

Michael.mast at 18:48, 16 January 2019

2019-01-16T18:48:22Z

Michael.mast: /* Docker */

2019-01-16T18:45:49Z

Docker

Michael.mast at 15:51, 8 January 2019

2019-01-08T15:51:17Z

Michael.mast: /* Postfix */

2018-12-06T20:36:55Z

Postfix

Michael.mast: /* Postfix */

2017-06-17T16:55:06Z

Postfix

← Older revision		Revision as of 20:27, 30 March 2021
Line 125:		Line 125:
	==Spam Filtering==		==Spam Filtering==
	<ref>https://docs.iredmail.org/enable.dnsbl.html</ref>		<ref>https://docs.iredmail.org/enable.dnsbl.html</ref>
		+	==Testing==
		+	===STARTTLS===
		+	<ref>https://halon.io/blog/how-to-test-smtp-servers-using-the-command-line/</ref>
		+	<pre>openssl s_client -connect vsp1.example.local:25 -starttls smtp</pre>

@@ Line 117: / Line 117: @@
 *Run postmap /etc/postfix/canonical
 *Add entry into /etc/postfix/main with the following "sender_canonical_maps = hash:/etc/postfix/canonical"
 ==Spam Filtering==
 <ref>https://docs.iredmail.org/enable.dnsbl.html</ref>

← Older revision		Revision as of 23:08, 10 September 2019
Line 117:		Line 117:
	*Run postmap /etc/postfix/canonical		*Run postmap /etc/postfix/canonical
	*Add entry into /etc/postfix/main with the following "sender_canonical_maps = hash:/etc/postfix/canonical"		*Add entry into /etc/postfix/main with the following "sender_canonical_maps = hash:/etc/postfix/canonical"
		+	==Spam Filtering==
		+	<ref>https://docs.iredmail.org/enable.dnsbl.html</ref>

← Older revision		Revision as of 22:32, 7 September 2019
Line 98:		Line 98:
	</pre>		</pre>
	Then I received mail. After much reading I found that people would either build additional mail servers or use something like Amazon's Simple Email Service (https://aws.amazon.com/ses/). Considering I have a lot to do I would just rather let Amazon handle the heavy lifting and move on with my life.		Then I received mail. After much reading I found that people would either build additional mail servers or use something like Amazon's Simple Email Service (https://aws.amazon.com/ses/). Considering I have a lot to do I would just rather let Amazon handle the heavy lifting and move on with my life.
		+	===Rewrite sender address===
		+	<ref>http://www.postfix.org/ADDRESS_REWRITING_README.html#forward</ref>
		+	For a simple relay that can only send using one address (i.e. O365) you can perform the steps in two ways.
		+	#<ref>http://www.postfix.org/ADDRESS_REWRITING_README.html#generic</ref>Generic rewriting will rewrite a matched string for the entire message. Sender and receiver is impacted.
		+	*Add strings to /etc/postfix/generic (or whatever file you want)
		+	<pre>
		+	@domain.tld office365@yourdomain.tld
		+	wrong@anotherdomain.tld office365@yourdomain.tld
		+	</pre>
		+	*Run postmap /etc/postfix/generic
		+	*Add entry into /etc/postfix/main with the following "smtp_generic_maps = hash:/etc/postfix/generic"
		+	#<ref>http://www.postfix.org/ADDRESS_REWRITING_README.html#canonical</ref>If you have the same sender and recipient then you would want to process just
		+	*Add strings to /etc/postfix/canonical (or whatever file you want)
		+	<pre>
		+	@domain.tld office365@yourdomain.tld
		+	wrong@anotherdomain.tld office365@yourdomain.tld
		+	</pre>
		+	*Run postmap /etc/postfix/canonical
		+	*Add entry into /etc/postfix/main with the following "sender_canonical_maps = hash:/etc/postfix/canonical"

@@ Line 73: / Line 73: @@
 <pre>
 docker build -t postfixtls -f Dockerfile .
-<pre>
+</pre>
 ==Postfix==

@@ Line 10: / Line 10: @@
 I got as far as configuring postfix to send email as a user, but this meant that every email I sent would be shown as coming from THAT user (or any other user that user has send on behalf as). Some of this is legitimate security but in the end it's just a pain for something that requires simple authentication.
 ==Docker==
 WIP

@@ Line 15: / Line 15: @@
 <br>
 Decided to work off what someone else already did. This is not as easy as I thought it would be, and this config ended up working well for me <ref>https://github.com/juanluisbaptiste/docker-postfix</ref>
-*Dockerfile
+<br>
 <pre>
 git clone https://github.com/juanluisbaptiste/docker-postfix.git
 cd docker-postfix/
-sudo docker build -t postfix -f Dockerfile .
+sed "s/Set\ needed\ config\ options/&\npostconf\ \-e\ \'mynetworks\ \=\ 10\.0\.0\.0\/8\,\ 172\.16\.0\.0\/12\,\ 192\.168\.0\.0\/16\'/" run.sh
 </pre>
 ==Postfix==

@@ Line 11: / Line 11: @@
 ==Postfix==
 Make sure to remove sendmail then install postfix and mailx. (don't forget about <b>cyrus-sasl</b><br>
 For the postfix configuration I added the following to the main.cf file