[Users] [Bug 4596] New: Attempt to connect to Gmail results in "IMAP error on imap.gmail.com: parse error (very probably non-RFC compliance from the server)"

[noreply at thewildbeast.co.uk]

https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4596

            Bug ID: 4596
           Summary: Attempt to connect to Gmail results in "IMAP error on
                    imap.gmail.com: parse error (very probably non-RFC
                    compliance from the server)"
           Product: Claws Mail (GTK 2)
           Version: other
          Hardware: Macintosh
                OS: other
            Status: NEW
          Severity: blocker
          Priority: P3
         Component: Folders/IMAP
          Assignee: users at lists.claws-mail.org
          Reporter: thewildbeast-sp at thegatesofdawn.org

Trying to rebuild folder tree using only combination of settings that doesn't
immediately tell me it can't connect to the server: using an application
password, STARTTLS on both send and receive, IMAP port 993. (Any change to any
of these settings makes connection attempt instantly fail with "*** TLS
handshake failed".) All other IMAP and SMTP settings work are the same ones
that work perfectly fine in my copy of Thunderbird. 

Error in log is:

* Account '[account name redacted]': Connecting to IMAP server:
imap.gmail.com:993...
** IMAP error on imap.gmail.com: parse error (very probably non-RFC compliance
from the server)

This is a new install of claws, I have never successfully used it. 

I'm skeptical that Gmail isn't RFC compliant, as every other email client I've
tried in the last 15 years was able to connect to it without this issue.

The reason I'm trying to rebuild the folder tree is it's the only thing that
has any effect at all. Trying to check emails just silently fails: nothing
happens at all, no log entries. 

Claws 3.19.0

System Information
GTK+ 2.24.33 / GLib 2.72.1
Locale: en_US.UTF-8 (charset: UTF-8)
Operating System: Darwin 18.7.0 (x86_64)

Installed on MacOS X 10.14.6 with homebrew.

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