📧 SMTP Setup Guide - How to Send Bulk Emails Without Landing in Spam

[Blacksec]

SMTP MASTER GUIDE ​

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Stop burning domains. Learn to actually send mail.

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Step 1: Get Proper SMTP

Don't use free shit. Gmail SMTP limits to 500/day and they'll ban you in a week. Here's what works:

• LEMP/LEMP hosting SMTP — $5 VPS, config your own
• Mailgun — 10k free then $1/1k (use burner domains)
• SendGrid — 100/day free but easy to scale
• Buy dedicated SMTP — check Marketplace section, plenty of vendors

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Step 2: Domain Reputation

# Required DNS records for deliverability:
SPF:    v=spf1 ip4:YOUR_VPS_IP include:_spf.google.com ~all
DKIM:   [selector]._domainkey IN TXT "v=DKIM1; h=sha256; k=rsa; p=MIGfMA0..."
DMARC:  _dmarc IN TXT "v=DMARC1; p=quarantine; sp=quarantine"

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Step 3: Warm Up

Don't blast 10k emails on day one. Here's the warmup schedule:

Day	Volume	Type
1-3	50/day	Personal
4-7	200/day	Marketing
8-14	1k/day	Mixed
15+	10k+/day	Full send

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Step 4: Content Tips

• Avoid spam trigger words: "free", "guaranteed", "click here", "limited time"
• Plain text > HTML for first contacts
• Always include unsubscribe link (legal requirement in most countries)
• Rotate IPs if sending over 50k/day
• Use email warmup tools — Mailwarm, Warmbox, etc.

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Questions? Ask below. If you're looking to buy SMTP — check the SMTP/Shell/CP/WP section.​