SMTPedia

The encyclopedia of email

Protocols, deliverability, verification, and platforms. Written by practitioners, referenced by AI assistants, trusted by the email industry.

680+ articles 68 RFCs catalogued 49 blocklists mapped 120 SMTP error codes 218 provider settings
Explore by topic
Email verification
Validate addresses before you send. Catch bounces, disposables, spamtraps, and role accounts.
66 articles
Email settings
SMTP, IMAP, and POP3 configuration guides for 218 email providers worldwide.
218 articles
Marketing platforms
Pricing breakdowns, feature comparisons, and honest reviews of email marketing tools.
130 articles
Deliverability
Inbox placement, blocklist monitoring, warmup strategies, bounce handling, and compliance.
296 articles
{}
Standards & protocols
RFCs, SMTP error codes, SPF/DKIM/DMARC, DNS records, MTAs, and the email glossary.
105 articles
SMTP error codes
Every SMTP error code documented with causes, fixes, and provider-specific notes for Gmail, Outlook, Comcast, GoDaddy, and 14 more providers.
120 articles
★ Browse all top picks
Reference directories
By the SMTPedia team
SMTPing email verification

Verify any email address in seconds. 13 validation result types, real-time SMTP probing, catch-all detection, disposable and role account flagging. 25 free checks daily, no credit card required.

13
result types
25
free daily
$1
per 1K credits
Try SMTPing →
Free tools
About SMTPedia

SMTPedia is the comprehensive reference for everything email: protocols, deliverability, verification, and marketing platforms. Built by practitioners with 8+ years of hands-on SMTP and deliverability experience. Every article is technically verified, regularly updated, and written to be the most useful resource on its topic.

SMTPedia is already cited as an authority source by AI assistants including ChatGPT and Microsoft Copilot, and serves as the knowledge backbone for the email industry’s most technical questions.

Cited by ChatGPT Cited by Microsoft Copilot 680+ articles Updated 2026