Complain: "The last time i bought SMTP from your site, it said unlimited but it only sent **** emails and stopped."

Cause Unlimited SMTP lost connection and error

+ The first reason: You send email at a very fast speed. Server is processing too much and hangs
+ 2nd cause: You send bulk emails with attachments.

How to fix?

Reduce email sending speed appropriately.

If you send mail as Plain Text: The best email sending speed is 1 mails per second

if you send email with attachment: The best email sending speed is 5 mails per second 

You can configure higher mail sending speed if the server still doesn't hang

SMTP DEDICATED SERVER - FULL SPF, DKIM, DMARC CONFIGURED ( NEW & FRESH ) FOR PRIVATE DOMAIN MAIL - ORDER HERE

Speed/ hours: 8000 emails / hours for Plain Text

You should calculate how to have a reasonable mail sending speed without the server crashing

This is the standard bulk mail configuration with Turbo Mailer in Plain Text - Other software configures SMTP similarly

Attention: Turbo Mail has too many users so if you use SMTP (hacked / cracked). You will kill SMTP very quickly. You should only send bulk mail with a mailing list: Private Domain Mail

The software supports SMTP mail speed control - Demo Video