Build Your Own SMTP Server Using aaPanel, Contabo VPS and Cloudflare | Send 36K Emails/Day

In this tutorial, join me as I walk you through the step-by-step process of creating your very own FREE SMTP server using aaPanel control panel, a powerful Contabo VPS, and the magic of Cloudflare’s performance optimization!

You should have an open port 25 VPS like Contabo VPS to be able send emails.

What you’ll need are Contabo VPS and Domain from Namecheap (or other name registrars). The rest are FREE!

✅ Contabo:
✅ Namecheap:

Support me by buying a coffee ☕:

Web version?️:

*aaPanel System Requirements*
1GB RAM
10GB Disk
CentOS 7.1+, Ubuntu 20.04, Debian10 (requires a minimum of 2GB RAM)

*Best Practices*
Warm your IP and Domain first before sending out mass email. Build trust for lifetime value.

*Best VPS for aaPanel with Open Port 25*

?Contabo (25 emails/minute):
?KnownHost (60 emails/minute):
?RackNerd (Unlimited):
?Hostinger (5 emails/minute):

*Tools and Services Used in this Tutorial:*

✅ Contabo:
✅ Namecheap:
✅ aaPanel:
✅ Bitvise:
✅ Cloudflare:
✅ Mail-tester:
✅ Thunderbird:

*My Other Free Email Server Setup Tutorials*

Email server setup with HestiaCP

Email server setup with FastPanel

Email server setup with CyberPanel

Email server setup with Cloudron

*You can also create WordPress websites on aaPanel*

*Troubleshooting*

1. You’re not fully authenticated
We were not able to check your DKIM signature

chmod 644 /www/server/dkim/domain.com/default.private
/etc/init.d/rspamd restart

Replace domain.com with your domain.

2. Your resverse DNS does not match with your sending domain

Be sure your reverse DNS matches with your hostname. Also, your MX mail server DNS should match with your hostname.

3. I can’t receive an email.

Replace _dmarc value with v=spf1 a mx ip6:IPV6Address ip4:IPV4Address -all
Change the IPV6Address and IPV4Address with your server’s IPv6 and IPv4 respectively.

4. aaPanel does not use SSL itself.

Go to Settings – Toggle off Panel SSL and Toggle back on
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