I run mutt from both Ubuntu and MacOS, and in the past week or so, they have been shutting down after only one minute. This morning, I finally decided to try "-d 5" and see what I coud see. This is that log, once it's settled down after startup and is idle.
[2018-02-19 04:58:02] mutt_addr_is_user: no, all failed. [2018-02-19 04:58:02] mutt_num_postponed: 0 postponed IMAP messages found. [2018-02-19 04:58:17] mutt_index_menu[1083]: Got op -2 [2018-02-19 04:58:32] mutt_index_menu[1083]: Got op -2 [2018-02-19 04:58:47] mutt_index_menu[1083]: Got op -2 [2018-02-19 04:59:02] mutt_index_menu[1083]: Got op -2 [2018-02-19 04:59:02] 4< * BYE Connection is closed. 13 [2018-02-19 04:59:02] Handling BYE [2018-02-19 04:59:02] Connection is closed. 13 [2018-02-19 04:59:04] Mailbox closed [2018-02-19 04:59:05] Looking up outlook.office365.com... [2018-02-19 04:59:05] Connecting to outlook.office365.com... [2018-02-19 04:59:05] Connected to outlook.office365.com:143 on fd=5 [2018-02-19 04:59:05] tls_socket_read (The TLS connection was non-properly terminated.) [2018-02-19 04:59:07] imap_cmd_step: Error reading server response. [2018-02-19 04:59:07] mutt_socket_close: Attempt to close closed connection. [2018-02-19 04:59:07] Error reading IDLE response [2018-02-19 04:59:09] mutt_index_menu[1083]: Got op 92 The Ubuntu mutt is NeoMutt 20170609 (1.8.3). The MacOS mutt is 1.5.23 (2015-03-12). Configurations are the same. set crypt_use_gpgme=no aset imap_check_subscribed=yes set imap_idle=yes set imap_keepalive=900 set imap_list_subscribed=no set imap_pass="$my_pass" set imap_passive=yes set imap_user="$my_u...@xxx.com" set mail_check=60 set smtp_pass="$my_pass" set smtp_url="smtp://$my_u...@xxx.com:$my_p...@smtp.office365.com:587" set ssl_starttls=yes set timeout=15 Configuration hasn't changed, password hasn't changed, account hasn't changed. Changing mail_check to 30 or 120 still shut down after 60 seconds. Changing imap_keepalive to 30 still shut down after 60 seconds, with IDLEs in the middle: [2018-02-19 05:18:56] mutt_num_postponed: 0 postponed IMAP messages found. [2018-02-19 05:19:11] mutt_index_menu[1083]: Got op -2 [2018-02-19 05:19:26] mutt_index_menu[1083]: Got op -2 [2018-02-19 05:19:26] 4> DONE^M a0011 IDLE^M [2018-02-19 05:19:26] 4< a0010 OK IDLE completed. [2018-02-19 05:19:26] 4< + IDLE accepted, awaiting DONE command. [2018-02-19 05:19:41] mutt_index_menu[1083]: Got op -2 [2018-02-19 05:19:56] mutt_index_menu[1083]: Got op -2 [2018-02-19 05:19:56] 4> DONE^M a0012 IDLE^M [2018-02-19 05:19:56] 4< * BYE Connection is closed. 13 -- ... _._. ._ ._. . _._. ._. ___ .__ ._. . .__. ._ .. ._. Felix Finch: scarecrow repairman & wood chipper / fe...@crowfix.com GPG = E987 4493 C860 246C 3B1E 6477 7838 76E9 182E 8151 ITAR license #4933 I've found a solution to Fermat's Last Theorem but I see I've run out of room o