Your provider's settings
IMAP and SMTP settings for 23 email providers lists each one's servers, from its own help pages, with a guide to adding it.
How email works
What a mail app does when it reads and sends your mail, and the settings that come with it: protocols, ports and security, explained from the standards.
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What is IMAP?
IMAP is how a mail app reads email that stays on your provider's server, so every device sees the same inbox. How it works, its ports and its settings.
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SMTP ports
Send from a mail app on port 465 (SSL/TLS) or 587 (STARTTLS). Port 25 is for servers, and often blocked. Which port each of 23 providers uses.
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IMAP ports
IMAP uses port 993 with SSL/TLS, or 143 with STARTTLS. 22 of the 23 providers we list use 993. What each means, and what to do when IMAP won't connect.
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POP3 vs IMAP
IMAP keeps your mail on the server, so every device stays in step; POP3 downloads it to one. Which to choose, their ports, and how to switch from POP3 to IMAP.
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