Gmail and iCloud suddenly (unavailable)

Just looked at the log: 03:13:55 Error: Could not resolve hostname “imap.mail.me.com” (domain: 12, error: 8)

Hope it helps

Firewall turned off

When I try to set-up a new IMAP account, message from the GUI:
Mailbox Retrieval Failed
Error: "Could not resolve hostname
"imap.mail.me.com" (domain: 12, error: 3)'

New log errors after attempting updating SMTP credentials and server details in both accounts:

03:22:44 Running action
03:22:44 Handling request
03:22:44 Clearing connection to imap.gmail.com
03:22:44 Ready to run action (type: 1000, retry count: 0)
03:22:44 Clearing connection to imap.gmail.com
03:22:44 Trying to connect to imap.gmail.com on port 993 (CFNetwork) without STARTTLS (required)
03:22:44 Error: Could not resolve hostname “imap.gmail.com” (domain: 12, error: 8)
03:22:44 Error code: 2
03:22:44 Failed action (1000). Reset observed read/write timeouts: 8/8

03:22:44 Handling reply
03:22:44 Running action
03:22:44 Handling request
03:22:44 Clearing connection to imap.gmail.com
03:22:45 Ready to run action (type: 1000, retry count: 1)
03:22:45 Clearing connection to imap.gmail.com
03:22:45 Trying to connect to imap.gmail.com on port 993 (CFNetwork) without STARTTLS (required)
03:22:45 Error: Could not resolve hostname “imap.gmail.com” (domain: 12, error: 8)
03:22:45 Error code: 2
03:22:45 Failed action (1000). Reset observed read/write timeouts: 8/8

03:22:45 Handling reply
03:22:45 Running action
03:22:45 Handling request
03:22:45 Clearing connection to imap.gmail.com
03:22:47 Ready to run action (type: 1000, retry count: 2)
03:22:47 Clearing connection to imap.gmail.com
03:22:47 Trying to connect to imap.gmail.com on port 993 (CFNetwork) without STARTTLS (required)
03:22:47 Error: Could not resolve hostname “imap.gmail.com” (domain: 12, error: 8)
03:22:47 Error code: 2
03:22:47 Failed action (1000). Reset observed read/write timeouts: 8/8

03:22:47 Handling reply
03:22:47 Running action
03:22:47 Handling request
03:22:47 Clearing connection to imap.gmail.com
03:22:50 Ready to run action (type: 1000, retry count: 3)
03:22:50 Clearing connection to imap.gmail.com
03:22:50 Trying to connect to imap.gmail.com on port 993 (CFNetwork) without STARTTLS (required)
03:22:50 Error: Could not resolve hostname “imap.gmail.com” (domain: 12, error: 8)
03:22:50 Error code: 2
03:22:50 Failed action (1000). Reset observed read/write timeouts: 8/8

03:22:50 Handling reply
03:22:50 Error: Failed multiple retries (4). Final error code was 2.
03:22:50 Terminating non-running connection...

Currently unable to re-import iCloud account from Mail. Import button disabled

https://i.imgur.com/dFeZ0b5.png

Tried to restore Application Support folder from a backup and nothing changed either

Mailmate also stopped to display messages

Stopping Malwarebytes and re-setting multiple messages did not fix the problem. Neither giving full disk access to MailMate from scratch:

Warning: Email not available on disk

### What happened?

MailMate was unable to find the email on disk. This means that you can see the headers of the message above, but you cannot see the real content of the email. The real content is still available on your IMAP server.

NOTE: Be careful. If you delete this email then you also delete the real email on the server.

### Why did this happen?

The most likely explanation is that you have anti-virus software installed which has some kind of quarantine feature. MailMate saved the email to disk, but the file was then immediately or later moved by the anti-virus software to a different location — presumably because malicious content was detected in the email.

MailMate detected this problem when trying to load an email from disk.

### Now what?

The best solution is to tell the anti-virus software to ignore the following folder:

~/Library/Application Support/MailMate/Messages

This should be quite safe, because if you try to view an attachment in such a message then it is first saved to a folder and this folder would still be monitored by the anti-virus software:

~/Library/Application Support/MailMate/Attachments

Note that if you do this then you can refetch messages using the “Message ▸ Reset...” menu item.

### I don't have antivirus software!

In that case the problem might be a MailMate bug. Please contact support by using the “Help ▸ Send Feedback” menu item.

First, be careful with replacing “~/Library/Application Support/MailMate” if you have used the “Custom Location” feature in the General preferences pane.

To make sure we get a clean start, I suggest (re)moving anything but the .plist files in this folder:

~/Library/Application Support/MailMate/

Then launch MailMate and take accounts online under Sources in the mailbox list if that hasn't already happened. MailMate should then, in theory, start synchronizing accounts from scratch.

If it still fails (which it likely will) then it appears the problem is related to the network connection. Have you changed anything in “System Preferences > Network”? Maybe related to the use of proxies? Or a firewall?

What if you open a Terminal window and connect manually to Gmail like this:

openssl s_client -crlf -connect imap.gmail.com:993

If it succeeds then you can disconnect by entering:

0 logout

If it doesn't succeed then the problem is definitely not related to MailMate.