Add support of ID extension in IMAP

wh201906 · November 26, 2022, 9:26am

Hi there.
Would K-9 add the support of ID extension in IMAP in the future? Someone else has already post the problem in the GitHub issues.

github.com/thunderbird/thunderbird-android

Add support for ID command to support 163.com

opened 02:12AM - 07 Jan 21 UTC

closed 02:13PM - 26 Apr 23 UTC

Aspire1Inspire2

enhancement

**Is your feature request related to a problem? Please describe.** I got reject…ed receiving mails using imap. I was trying to log in to 163 email server when this happens. **Describe the solution you'd like** I was told that the email client app should return its identity to allow connecting to the email server. The developer of that email server provides the following code: ``` Properties props = new Properties(); props.setProperty("mail.store.protocol", "imap"); props.setProperty("mail.imap.host", "imap.163.com"); props.setProperty("mail.imap.port", "143"); HashMap IAM = new HashMap(); //IMAP ID: key, value pair. E.g. name，version，vendor，support-email IAM.put("name","myname"); IAM.put("version","1.0.0"); IAM.put("vendor","myclient"); IAM.put("support-email","testmail@test.com"); Session session = Session.getInstance(props); IMAPStore store = (IMAPStore) session.getStore("imap"); //user account and password store.connect("testmail@163.com", "password"); store.id(IAM); ``` The developer provides the following link to explain context: https://javaee.github.io/javamail/docs/api/index.html?com/sun/mail/imap/IMAPStore.html Could you evaluate if this situation is a valid case to make it more secure/compatible with imap server?

This extension is defined in RFC 2971
I know it sucks because the 163 mail(Netease) doesn’t follow the RFC standards, but considering that 163 mail has a lot of users(mostly in China), I think it would be more convenient.

 Servers MUST NOT deny access to or refuse service for a client
 based on information from the ID command.  Clients MUST NOT refuse
 to operate or limit their operation with a server based on the ID
 response.

wh201906 · November 26, 2022, 9:36am

For your information, the built-in Mail app in Windows 10 works well with the 163 mail, so I guess the ID extension is implemented in it.