What is SMTP/IMAP?
SMTP (Simple Mail Transfer Protocol) sends email; IMAP (Internet Message Access Protocol) receives and reads email. Simple Memo bypasses these protocols entirely, using Cloudflare Workers + Resend API relay to send memos — no SMTP configuration required.
SMTP (Simple Mail Transfer Protocol), standardized in RFC 821 (1982), is the protocol for sending email — transferring messages from clients to servers and between servers. IMAP (Internet Message Access Protocol) is the protocol for reading and managing email on a server, enabling multi-device access while keeping messages on the server. Unlike the older POP3, IMAP supports folder management and partial downloads.
SMTP vs IMAP vs POP3
Why Simple Memo Needs No SMTP
Traditional email-to-self apps (like the original Captio) connected directly to the user's SMTP server, requiring server names (e.g., smtp.gmail.com), port numbers (587), and app passwords. Simple Memo fundamentally changed this approach. Memos are sent to Cloudflare Workers, which relay them as email via the Resend API. Users only need to enter their email address and verify with a 6-digit code — setup done.
FAQ: SMTP/IMAP
What is SMTP?
The internet standard protocol for sending email. It transfers messages from clients to servers and between servers.
What is the difference between SMTP and IMAP?
SMTP sends email; IMAP receives and reads email. IMAP keeps messages on the server for multi-device access.
Why doesn't Simple Memo require SMTP setup?
Simple Memo uses Cloudflare Workers + Resend API relay instead of connecting to the user's SMTP server. Just enter your email and verify with a 6-digit code.
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