How to make emails automatically sent to spam

Question

PHP

I am developing one website, from which users will receive mail about various events (message received, votes created, added to a group ... like in a contact).
Now I have raised the alpha version of the site for the customer on my local computer (I have a static IP) and letters are sent from here by the usual mail function from php. These letters end up in spam, but the customer wants the letters to arrive normally, as several of his acquaintances use the site (~ testers). When the site is ready, I will raise it to aws, but for now, for lack of time, it hangs on my computer.
So, I need to somehow make sure that the emails don't end up in spam, or at least provide evidence that this will take a lot of time / resources and is not worth doing yet.

Answer 1

habrahabr.ru/qa/5603/
habrahabr.ru/qa/14954/
habrahabr.ru/qa/1901/
habrahabr.ru/qa/3888/
Well, etc., the search decides.

Answer 2

Short answer: no way.
Since you are not in control of the spam cutter and its rules are unknown to you.
Long answer: spam on which client? gmail? Spam cutters trust messages sent through normally configured mail servers more than from home PCs.
Try to send letters through some account on the mail server (yes, at least the same gmail). Only the mail function will not work, apparently Pear is needed.
here is an example: www.php.net/manual/en/function.mail.php#39305

Answer 3

1.) Through Gmail stackoverflow.com/questions/4982821/send-email-from-localhost-with-gmailwindows
2.) www.mailjet.com/
Roughly speaking SMTP proxy server, very easy to set up, up to 6000 emails per month for free ( I think you will have enough for 2-3 testers :D)

Answer 4

Send emails via SMTP - for example, using SwiftMailer .