IMAP usernames sometimes need to contain "@"

積丹尼 Dan Jacobson <[email protected]>
Newsgroups gmane.comp.gnu.mailutils.bugs
Message-ID <[email protected]>
Boy you mailutils guys really really blew it, perhaps.

You never guessed that the username might need to contain a "@", and be
independent of the hostname.

$ mail --file imaps://[email protected]:[email protected]
Cannot create mailbox imaps://[email protected]:[email protected]: Invalid port or service specification

So you need to put a workaround into
(info "(mailutils) Remote Mailboxes")

To prove that this really works, this works fine:
$ tail .getmail/getmailrc

[retriever]
server=homie.mail.dreamhost.com
type=SimpleIMAPSSLRetriever
port=993
[email protected]
password=MYPASS

More proof
https://help.dreamhost.com/hc/en-us/articles/215612887#Example_setup_using_a_secure_IMAP_connection
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