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Editorial Team
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Asked: 2026-05-28T06:55:39+00:00

I am developing a social networking site. It has functionality like user registration, people

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I am developing a social networking site. It has functionality like user registration, people exchanging messages and sending email notifications for people’s actions (and many more).

Currently I use PHP’s mail function to send mails and it is working fine. I already set up a VPS and hosted the application.

My question may be a dumb question. Do Facebook and other social networking sites use SMTP servers to send the notifications or only just any kind of PHP mail function?

I read somewhere that using PHP’s mail, there is a chance of mail going to SPAM folder. They advised using a certified SMTP server.

So, if I have to use an SMTP server:

1) Do I have to purchase a certified SMTP server separately? Or can this be hosted on same VPS whatever I have. If so, what server software will be good for this?

2) Are there settings I have to do in SMTP servers like send unlimited messages, because we don’t know how many people exchange emails in a minute, and that is totally random.

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1 Answer

  1. Editorial Team

    The issue here is not really with the mail() function in itself, but in how you construct the emails. Messages can be treated as spam for a million and one reasons, but it is generally accepted that if you use one of the tried and tested mailer libraries, like Swiftmailer or PHPMailer (both free) there is marginally less chance of your messages being treated as spam.

    Whether your messages get treated as spam is far more about how you construct your messages than how you send them. Another major factor is if your server sends thousands and thousands of emails all the time, so another hint is to be sparing with the emails you send out – only send them when you actually need to.

    If you really want to know the answer to this question, you should do some reading on exactly how the modern email system works. Being able to build and send good emails is all about knowing how to work the system. Start here.

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