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Sylpheed IMAP setup for icloud.com mail and Gmail accounts

(1) For icloud.com mail

It is necessary to go to Apple's Apple ID site and set up two factor authentication, and set up an application specific password for Sylpheed

In Sylpheed "Account preferences" menu:

Basic
Server Information: Protocol: IMAP4
Server for receiving: imap.mail.me.com
SMTP server (send): smtp.mail.me.com
User ID: username (not username@icloud.com)
Password: Use the account-specific password you set up on Apple ID site
Receive
IMAP4: Authentication method: LOGIN
Send
Authentication: Check "SMTP Authentication (SMTP AUTH)"
Authentication method: LOGIN
User ID: username@icloud.com
Password: Use the account-specific password you set up on Apple ID site
SSL
IMAP4: Use SSL for IMAP4 connection
Send(SMTP): Use STARTTLS command to start SSL session
Advanced
Check "Specify SMTP port": 587

(2) For Gmail

It is necessary to go into Gmail, activate IMAP, and go to "Allow less secure apps" and choose 'Allow'.

In Sylpheed "Account preferences" menu:

Basic
Server Information: Protocol: IMAP4
Server for receiving: imap.gmail.com
SMTP server (send): smtp.gmail.com
User ID: username@gmail.com or username@domainname.com if you have Gmail using your own domain name.
Password: Use your Gmail password
Receive
IMAP4: Authentication method: Automatic
Send
Authentication: Check "SMTP Authentication (SMTP AUTH)"
Authentication method: Automatic
User ID: leave blank
Password: leave blank
SSL
IMAP4: Use SSL for IMAP4 connection
Send(SMTP):Use SSL for IMAP4 connection
Advanced
Use default SMTP and IMAP4 ports (654 and 993)