{"id":2639,"date":"2015-04-17T10:22:22","date_gmt":"2015-04-17T10:22:22","guid":{"rendered":"http:\/\/wiki.davelevy.info\/?p=2639"},"modified":"2025-05-27T09:34:26","modified_gmt":"2025-05-27T09:34:26","slug":"my-little-mail-server","status":"publish","type":"post","link":"https:\/\/davelevy.info\/wiki\/my-little-mail-server\/","title":{"rendered":"My little mail server"},"content":{"rendered":"\n

What a pile of poo! I have access to four smtp servers and they all have limits on the distribution list size! (They are all about the same size of 100). Google will allow 2000 per list but only if you use one of their clients. Let’s try and bring up an SMTP server, connect it to DNS, and then send them myself.<\/p>\n\n\n\n\n\n\n\n

This page was started in 2016 when I was interested in sending large circulation news letters. I became interested again when I felt I wanted to host some services on my ‘Pi.<\/p>\n\n\n\n

Is it worth it?<\/h3>\n\n\n\n

i.e. making postfix\/exim work; a good friend tried running his mail server\/service from home and found that keeping up with anti-spam\/encryption technology was a lot of work calling on expertise at the edge of his interest. He uses Runbox<\/a> as his provider now. Can this be made to do what I want?<\/p>\n\n\n\n

Raspberry Pi<\/h3>\n\n\n\n

I returned to this in Nov 2022 and found these resources, as I turned my attention to Raspberry Pi and away from Amazon, it’s too expensive for a hobbyist. My use case is now a low volume activity. <\/p>\n\n\n\n

I chose postfix as my mail tool[s]<\/p>\n\n\n\n

Postfix<\/h3>\n\n\n\n
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  1. Setting it up\n
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    1. How to setup email alerts on linux using gmail<\/a> from \u201cHow to Geek\u201d, they use ssmtp<\/code>. This article has a diagram, and includes dovecot on its solution & How to set up a mail server on your Raspberry Pi?<\/a> from Raspberry Tips,  which uses postfix<\/code>. <== This looks like the best. I use NOIP to obtain a DNS address, and will need to use it to set the MX record, however, additional TXT records including the RARP record are chargeable.<\/li>\n\n\n\n
    2. As I worked my way through this, I came across a series of articles by Linux Babe, starting with  Build Your Own Email Server on Ubuntu: Basic Postfix Setup<\/a> which deals with the install and DNS configuration.<\/li>\n\n\n\n
    3. Simple Email Configuration on a Raspberry Pi<\/a> from the Raspberry Pi forums<\/li>\n<\/ol>\n<\/li>\n\n\n\n
    4. Making it work\n
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      1. These two links suggest that postfix & DNS maybe enough, from O’Reilly ,Postfix: The Definitive Guide by Kyle D. Dent,<\/a> and Kiero Connect, Essential DNS Records for Mail Delivery and Spam Protection<\/a>, it seems they are.<\/li>\n\n\n\n
      2. See also, postfix<\/a> from archlinux.org which includes details on checking the config.<\/li>\n\n\n\n
      3. I was pointed at https:\/\/medium.com\/20ms\/configuring-ssl-tls-for-postfix-5c87cb54aa89<\/a> which documents installing ssl on Centos. <\/li>\n\n\n\n
      4. No routing intermediaries are needed, postfix and the responder both use DNS. We’ll see. I have now sent mail out of my servers, but they are rejected by the target servers with SPF or DKIM errors. A note on SPF and DKIM<\/a> at linuxbabe. The SPF tests requires a reverse lookup DNS record which noip<\/em> do not <\/strong>support, or do not support on change of address. Thus I need to consider using a different DNS provider or mail solution. <\/li>\n<\/ol>\n<\/li>\n<\/ol>\n\n\n\n

        I moved my notes on the mail utilities to this modal.<\/p>\n\n\n\n