Own mail server?

Question

linux

Good day to all !
Today my question is related to my own mailing list server.
The problem statement is as follows:
There is a customer base that needs to be uploaded to the mailing service and sent beautiful message templates (in html format) + preferably the possibility of subscription and analytical tools.
The fact is that it should not be an external service like Mailchimp, etc., I want the service to be my own, on my own servers.
The number of sent messages per day is planned for 50 - 100 thousand addresses.
Please recommend what type of assembly can be used?
For example now I'm using: PG Newsletter script + Postfix
This implementation does not suit me :-( it works painfully crookedly (in the version that I have).
Please tell me what can be best assembled for my task?
Oh, well, yes, I also wanted to add that it could be implemented free (No software purchase)
Thank you in advance for your answers.

Answer 1

mailman?

Answer 2

Usually, for mass mailings from client IPs, the provider can very quickly close port 25 on the way out and 2/3 of all mail services will consider your letters as spam

Answer 3

It won't work very well. mailchimp and the like exist because if you don’t want to seriously dive into the sphere of bulk mailing (learn all sorts of greylisting, DKIM, DCC, DMARC, SPF, DNSBL, FBL, ARF, and also SMTP and DNS, automatically process bounces and ansubscribes) - and it will take a serious time - then it will not work properly to start it. Mailing services exist not because foolish clients did not guess to send a letter a hundred thousand times in a cycle, but because they are cheaper than sending out by yourself (time is also not free, and the lost profit from undelivered letters is real)
1. MTA
postfix - like any other MTA for general use, not the best option. Not sure if it will work. He's for a very reliable delivery, which is bad. Need fast and less reliable.
If you have a hundred thousand recipients, there will inevitably be "dead" ones among them. Letters to them will remain in the queue for several days and will constantly be resent. Attempts to reach a dead server will take up time during which no other mail will be sent. Well, or you will have to study it very well, twist the queue settings. (=wasting time which is money).
2. Spam
Even if it seems to you that your letters are crystal clear, they will still end up in spam. If only because many users press the "this is spam" button instead of unsubscribing. And very soon, almost all of your mail will fall into spam everywhere (even for those users who want to receive it) and there will be no sense in mailing lists. In addition, the hoster will be abused, and he will ask you very soon, and you will have to move to a bad and expensive bulletproof hosting.