I'm currently setting up a mail server for mass mailing on a non-profit. I decided to go with Postfix since I had some experience with the configuration. However my experience was for multi domain environments backed by a MySQL DB not a mass mailing solution.
What I'm trying to accomplish needs to meet the following:
- SMTP server that allows to send emails from any email address / domain they choose;
- Only allow to send the emails with those domains from the server itself, to avoid running this as an open-relay and have spam issues;
- Still have a
virtual_aliases
,mailbox-domains
,mailbox-maps
configuration based on a MySQL DB so I can create internal emails@massmail.example
to use as email bounce / return path to track errors;
My current config is a multi domain environment, I'm able to add domains and users into the MySQL DB like bounces@massmail.example
, connect to SMTP, send mail and receive over IMAP. Everything works fine.
However, how am I supposed to implement the part: "send emails from any email address / domain they choose"?
To send emails from news@non-profit.com
, should I:
- Add the domain
non-profit.com
to thevirtual_domains
table and create the usernews@non-profit.com
at thevirtual_users
, login with that address and send the emails? - Login with the internal bounce email
bounces@massmail.example
use it to send email but change theFROM
header tonews@non-profit.com
?
What's the correct options in terms of SPAM detection bulk sending compliance? Any of the above or something else? How does platforms like mail chimp handle this?
I tried the option (2) and gmail, for instance, says something like this:
Best Answer
You cannot have mass mailing, without SPAMMING, unless users have registered, and approved their email address, or any other 2 factor acknowledgment.
Restrict MTA to IP, edit main.cf and add the IP's you wish to send from. i.e... inet_interfaces = public-ip,127.0.0.1
create a generic map for the different domains they wish to send from. see for example: http://www.cyberciti.biz/tips/howto-postfix-masquerade-change-email-mail-address.html