How do I join SMTP?

Simple Mail Transfer Protocol (SMTP) is a standard protocol for sending emails across the internet. Joining an SMTP server allows you to send emails from your own domain name and address rather than relying on consumer email providers. There are a few easy steps to get setup with SMTP:

How do I join SMTP?

Understand the Basics of SMTP

SMTP is used to transfer email messages from one server to another until it reaches the recipient’s email inbox. Here’s a quick overview:

  • SMTP accepts outgoing mail from email clients and routes it out to the next SMTP server. This routing continues until the email reaches the recipient’s email server.
  • Popular SMTP server software includes Postfix, Sendmail, and Exchange Server. SMTP is included in all web hosting plans.
  • SMTP works with other email protocols including POP3 and IMAP which are used for retrieving emails.

Decide How You Will Host Your SMTP Server

You have a couple options for hosting an SMTP server:

Shared Hosting SMTP

  • This is the easiest setup since your web host provides SMTP servers.
  • However, shared SMTP servers are often blocked due to spam. Deliverability rates tend to be low.

Dedicated SMTP Hosting

  • For the most reliable SMTP email delivery, use a dedicated SMTP hosting provider.
  • They optimize IP reputation to achieve 90%+ delivery rates.
  • Costs start around $10/month for a basic plan.

Point Your Domain’s MX Records to Mail Servers

MX records tell other mail servers where to deliver email addressed to your domain. Here’s how to setup MX records correctly:

  1. Log in to your domain registrar account and access DNS record settings.
  2. Add a MX record pointed to your dedicated SMTP provider’s mail server.
  3. Set the hostname prefix to “mail”. For example,

This properly routes emails to your mail server.

Tip: Lower MX priority numbers indicate higher priority servers.

Add SPF & DKIM Records for Security

To further improve deliverability and security:

  • Add an SPF record allowing your SMTP IP address.
  • Add a DKIM record to sign outbound messages.

This verifies your domain identity and builds email authentication.

Connect an Email Client to Send Mail

Finally, connect your email client like Gmail or Outlook to your SMTP server using the provided credentials. Then you can start sending emails from your custom domain!

Monitor inbox placement rates to see if deliverability meets your needs. Troubleshoot issues with your SMTP provider if emails land in spam.

Key Takeaways

  • Joining an SMTP server allows sending emails from your own domain and addresses.
  • Decide between shared hosting SMTP or dedicated SMTP hosting plans.
  • Set the MX records at your registrar to route mail to your servers.
  • Adding SPF and DKIM records improves security and deliverability.
  • Connect an email client to your SMTP server to send mail from your domain.

Following these steps allows you to get set up with a reliable, reputable SMTP server for your domain email needs.


Joining an SMTP server enables sending professional emails from your own branding rather than unreliable consumer email platforms. Keys to success include pointing your MX records properly, improving security with SPF/DKIM records, choosing reliable SMTP hosting, and monitoring inbox placement rates.

With a dedicated SMTP provider optimizing email reputation and a proper DNS setup, you can achieve email deliverability exceeding 90%. This allows reliable communication from custom email addresses matching your domain name and brand.

Frequently Asked Questions

  1. What is the difference between SMTP vs POP3 vs IMAP?
    SMTP is used for sending outgoing emails. POP3 and IMAP are protocols for receiving and retrieving emails from a mail server into an email client.

  2. What port does SMTP use?|
    SMTP communicates over port 25 for unencrypted connections. For SSL/TLS connections, it uses port 465 or 587.

  3. Is Gmail SMTP servers reliable?
    Gmail SMTP servers are often blocked due to reputation issues from widespread use. For best deliverability, use a dedicated SMTP provider instead.

  4. Can I use my own server as an SMTP server?
    Yes, you can setup Postfix, Send ail, Exchange Server, or other mail server software on a VPS or dedicated server. But properly administering your own mail server is complex.

  5. What is the difference between SPF and DKIM?
    SPF verifies the sending server’s IP address, preventing spoofing. DKIM digitally signs messages to confirm they have not been altered in transit.

  6. What happens if I don’t setup SPF or DKIM?
    Lack of SPF and DKIM records increases spam score. Emails are more likely to be flagged as spam or rejected entirely.

  7. What tools can check inbox placement rates?
    Services like MailTester, Mail-Tester, or Email Deliverability Check provide inbox placement checks across major ISPs to confirm email reputation.

  8. How do I change the “from” email address?
    Connect your email client to your SMTP server using the provided credentials. This allows you to send mail from any address @ your domain rather than consumer email platforms.

  9. How do I change the “reply” email address?
    Update the Reply-To header within your email client when composing the message. This sets the reply address recipients use.

  10. Why does my mail get rejected for “wrong MX records”?
    This means the MX records at your domain registrar are still pointing to previous mail servers rather than your current SMTP provider. Double check they are updated to match.

  11. Can I use the same SMTP provider as my friend?
    While possible, it’s best for deliverability to use a dedicated account at your SMTP provider instead of sharing. This gives you distinct IPs with separate sending reputation.

  12. What is warms up for SMTP servers mean?
    Warming up an IP involves slowly increasing sending volume which improves inbox placement rates over time as reputation builds. This process can take several weeks. Send in low volumes initially.

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