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cURL and IMAP - accessing a shared mailbox in an IMAP Exchange Server

From: Allan Quadros via curl-users <>
Date: Wed, 22 Jul 2020 20:17:17 -0300


According to this link (, the appropriate way
of accessing a shared mailbox on an IMAP Exchange Server from an IMAP
client is to pass the user information as
"user_at_company\sharedmailbox". Supposedly, the client would be able to
impersonate the user and access the shared mailbox.

However, when I try to replicate this recommendation using curl, I get
login denied.

curl --url "imaps://" --user

Can someone please confirm if that is the correct way of accessing a
shared mailbox using cURL? Perhaps I am missing something or my server
settings do not allow it, so it would be good to know whether someone
successfully did this before, even if it was on a different IMAP

Thanks in advance.


curl -V
curl 7.70.0 (x86_64-pc-linux-gnu) libcurl/7.70.0 OpenSSL/1.1.1 zlib/1.2.11
Release-Date: 2020-04-29
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s
rtsp smb smbs smtp smtps telnet tftp
Features: AsynchDNS HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB SSL
TLS-SRP UnixSockets
Received on 2020-07-23