gnus multiple nnimap accounts

.gnus.el

;; see my config for the other parts:
;;
;; https://github.com/creichert/dotfiles/blob/master/emacs/.gnus
;;
;; I typically put the below settings into a file called `gnus-private.el`,
;; and require that into my gnus to populate these settings.
;;
;; https://github.com/creichert/dotfiles/blob/master/emacs/.gnus#L61

;; ~/.authinfo.gpg
;; machine second login second@gmail.com password pass3
;; machine third login third@domain.com password pass2
(setq gnus-secondary-select-methods
      '(
        (nnimap "second"
                (nnimap-address "imap.googlemail.com")
                (nnimap-authinfo-file "~/.authinfo.gpg")
                (nnimap-stream ssl))

        (nnimap "third"
                (nnimap-address "imap.somedomain.com")
                (nnimap-authinfo-file "~/.authinfo.gpg")
                (nnmail-expiry-wait 'never)
                (nnimap-stream ssl))))


;; To setup "outgoing" address, you need to be aware of a few basics:
;;
;; - gnus-parameters  (these are group parameters and take precedence)
;;
;; - gnus-topic-parameters (think of topics as simply "fitting over" groups precedence-wise)
;;
;; WARNING:
;;
;; The biggest thing to watch out for when sending outgoing mails, is that gnus/message.el tend
;; to "replace" the address with your default automatically if everything is not configured correctly.
;;
;; I DONT use a default `user-mail-address` value. Instead, I ensure it's set properly in all my
;; posting-styles, and I'm alerted when it's not.
;;
;; Additionally, I use the "sendmail-envelope-from", so that my smtp sendmail function, simply
;; uses that: https://github.com/creichert/dotfiles/blob/master/emacs/.gnus#L221-L226
(setq

 ;; visible inboxes, helps to enter them to see old mail, if you didn't handle it immediately.
 ;;
 ;; gnus-permanently-visible-groups "^nnimap\\+main:INBOX\\|^nnimap\\+secondary:INBOX"

 ;; default citation styles, do you want ">" (the default) or "gmail" style?
 ;; message-cite-reply-position 'above
 ;; message-cite-style 'message-cite-style-gmail

 ;; when you enter a group and the regexp matches, the parameter is enabled.
 gnus-parameters
 '(
   ;; default settings
   (".*"
    (large-newsgroup-initial . 20))

   ;; default imap settings
   ("^nnimap"
    ;; not working, but the idea is to keep headers better in-sync. you'll
    ;; eventually run into a problem (esp. with gmail) that it's hard to access
    ;; old threads. this might need a similar technique as the dynamic
    ;; message-cite-style below.
    (gnus-fetch-old-headers . some)
    (expiry-wait . immediate)
    (expiry-target . delete))
   ("nnimap\\+second:.*"
    ;; outgoing address when replying in this group.
    (address . "second@address.com"))
   ;; virtual inbox handling, if that's your thing
   ("nnimap\\+third:\\[Gmail\\]/.*"
    (display . none)
    (expiry-wait . never)))

 ;; Set additional posting styles when creating a message. Options specified
 ;; here are overwritten by `gnus-parameters`
 gnus-posting-styles
 '(
   (".*"  ;; defaults
    (name user-full-name)
    (address "personal@address.com"))

   ("nndraft:.*"
    (From (with-current-buffer gnus-article-buffer
            (message-fetch-field "from"))))

   ("nnimap\\+third:"
    ;; smtpmail-send-it support, you need to add this header in your posting-style,
    ;; it will be removed before sending. (i don't know if the "third@address.com" needs
    ;; to be the "from" or the "username", just look that up.
    ;;("X-Message-SMTP-Method" "smtp smtp.server2.com 587 third@address.com")
    (address . "third@address.com"))

   ((header "Reply-To" ".*@reply.github.com")
    (address "mygithub@address.com")
    (signature nil)
    (mail-citation-hook)
    (organization nil)
    ;; dynamically set message-cite-style
    (eval
     (set (make-local-variable 'message-cite-style) nil))
    )))

;; The eval-after-load may not be necessary
;;
;; I set these, but read the docs:
;;
;;  (setq-default gnus-subscribe-options-newsgroup-method 'gnus-subscribe-topics)
;;  (setq-default gnus-subscribe-newsgroup-method         'gnus-subscribe-topics))
(eval-after-load 'gnus-topic
  '(progn
     (setq
      gnus-topic-topology
      '(("Gnus" visible nil nil)

        (("misc" visible nil
          ((subscribe . "nndraft:")
           (subscribe . "nnfolder:")
           )))

        (("main" visible nil
          ((subscribe . "^INBOX"))))

        (("second" visible nil
          ((subscribe . "nnimap\\+second:")
           (subscribe-level . 5))))

        (("third" visible nil
          ((subscribe . "nnimap\\+third:"))))))))