Check IMAP and POP with OpenSSL

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[1][2][3][4]Currently I have little understanding as to what I am looking at. More specifically I do not know what the "-crlf" in openssl does or how to find the rest of the flags fields for fetching messages. 

openssl s_client -connect imap.gmail.com:993 -crlf
a login <username> <password>
a select inbox
a FETCH 1 (FLAGS BODY[HEADER.FIELDS (subject)])
a store 1 +flags /deleted
a expunge
a close
a logout

SMTP

[5] 

openssl s_client -starttls smtp -connect smtp.office365.com:587 -crlf
250 CHUNKING
ehlo
250-DM5PR04CA0045.outlook.office365.com Hello [64.191.109.50]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-AUTH LOGIN
250-8BITMIME
250-BINARYMIME
250 CHUNKING
auth login 
334 VXNlcm5hbWU6
  1. ↑ https://donsutherland.org/crib/imap
  2. ↑ http://stackoverflow.com/questions/14959461/how-to-talk-to-imap-server-in-shell-via-openssl
  3. ↑ http://busylog.net/telnet-imap-commands-note/
  4. ↑ https://social.msdn.microsoft.com/Forums/en-US/9ac90ca5-e527-4372-98da-d7056818ebe2/imap-command-for-delete-the-mail-from-gmail-using-uid?forum=csharpgeneral
  5. ↑ http://www.samlogic.net/articles/smtp-commands-reference-auth.htm
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