What is the best way to organize the automatic creation of an e-mail box during user registration?

Question

Computer networks

Actually a subject.
There is a site, there is registration on the site, it is required when registering a user to automatically create an e-mail box for him, the user cannot send messages from this box, sending is not required at all, he can only receive certain messages that are displayed in the corresponding section of the site. It is desirable to be able to control (select\change) the mail domain.
Naturally, the solution should be as budget-friendly as possible, because there is no monetization of all "this" (I will not describe the entire service)!

Initially I wanted to run my own server using hMailServer and DDNS (eg no-ip or duny). However, problems immediately arose with the ports, in other words, everything was cut and blocked.
It turns out that only VPS remains? Maybe there are other solutions?

Answer 1

Dmitry ,

Really there are no ready services? Something like "mail hosting", where you can create and delete mailboxes as much as you like, via SSH or some other interface.

gmail, registration via web interface.
Even if such a service exists somewhere, it is a completely unclaimed solution that is almost impossible to monetize. Therefore, if one is found, there is no guarantee that it will not close in a month or a year.
Therefore, the decision of such a plan must be done by yourself. It’s simple - if you don’t need to send mail, then you also don’t need to think about any blacklists and PTRs, there are already local mailboxes on ANY Linux, it remains to fasten any mailer to the reception and create either users or alias-s

Answer 2

In general, you want something strange, perhaps while you yourself do not fully understand what:

There is a site, there is registration on the site, it is required when registering a user to automatically create an e-mail box for him, the user cannot send messages from this box, sending is not required at all, he can only receive certain messages that are displayed in the corresponding section of the site.

Why would you make a box in which you can not send mail?
What is the case?
As I see it, you just need to register users on the LC site and send messages there.

It is desirable to be able to control (select\change) the mail domain.

It's not a question, depending on what the site is written on, write the code that will do it.

Naturally, the solution should be as budget-friendly as possible, because there is no monetization of all "this" (I will not describe the entire service)!

Unlikely.

Initially I wanted to run my own server using hMailServer and DDNS (eg no-ip or duny). However, problems immediately arose with the ports, in other words, everything was cut and blocked.
It turns out that only VPS remains? Maybe there are other solutions?

Yes, it turns out VPS, in any case, you need a permanent IP, PTR record and everything else, home providers will not have this.